BRLT · Brilliant Earth Group, Inc.

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting person prior to the Issuer's initial public offering, do not expire.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,823 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 687,544 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

This transaction was executed in multiple trades at prices ranging from $1.25 to $1.40, inclusive. The reported price reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the United States Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was affected.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting person prior to the Issuer's initial public offering, do not expire.

Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,823 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 687,544 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

This transaction was executed in multiple trades at prices ranging from $1.25 to $1.40, inclusive. The reported price reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the United States Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was affected.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting persons prior to the Issuer's initial public offering, do not expire.

Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,823 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 687,544 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting persons prior to the Issuer's initial public offering, do not expire.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Consists of (i) 31,098,704 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,823 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 687,544 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 48,824 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 97 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 1,079 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

The transactions reported herein were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025.

This transaction was executed in multiple trades ranging from $1.01 to $1.06. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

The transactions reported herein were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025.

This transaction was executed in multiple trades ranging from $1.04 to $1.12. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $95,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2027 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $95,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2027 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $95,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2027 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 14, 2025.

This transaction was executed in multiple trades ranging from $1.12 to $1.21. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Grant of restricted stock unit award under the Issuer's 2021 Incentive Award Plan. The award will vest as to 25% of the restricted stock units initially subject to the award on February 15, 2026 and as to 1/16th of the restricted stock units initially subject to the award on each quarterly anniversary thereafter until the award is fully vested, subject to the reporting person's continuing to provide services to the Issuer or its subsidiaries through the applicable vesting date.

Grant of restricted stock unit award under the Issuer's 2021 Incentive Award Plan. The award will vest as to 25% of the restricted stock units initially subject to the award on February 15, 2026 and as to 1/16th of the restricted stock units initially subject to the award on each quarterly anniversary thereafter until the award is fully vested, subject to the reporting person's continuing to provide services to the Issuer or its subsidiaries through the applicable vesting date.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 14, 2025.

This transaction was executed in multiple trades ranging from $1.28 to $1.47. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 14, 2025.

This transaction was executed in multiple trades ranging from $1.925 to $2.11. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. The transactions reported herein were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2024.

This transaction was executed in multiple trades ranging from $1.33 to $1.37. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $140,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2026 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $140,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2026 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $140,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2026 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Grant of a restricted stock unit award under the Issuer's compensation program for non-employee directors which provides for an annual grant of restricted stock units to non-employee directors calculated by dividing (a) $140,000 by (b) the average closing trading price of the Issuer's Class A common stock over the most recent completed month as of the grant date, rounded down to the nearest whole restricted stock unit. The award will vest on the earlier of the first anniversary of the grant date or the date of the Issuer's 2026 annual stockholder's meeting, subject to continued service through the applicable vesting date.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. The transactions reported herein were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2024.

This transaction was executed in multiple trades ranging from $1.32 to $1.38. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. The transactions reported herein were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 3, 2024.

This transaction was executed in multiple trades ranging from $1.36 to $1.40. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024

This transaction was executed in multiple trades ranging from $1.34 to $1.53. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Grant of restricted stock unit award under the Issuer's 2021 Incentive Award Plan. The award will vest as to 25% of the restricted stock units initially subject to the award on February 15, 2026 and as to 1/16th of the restricted stock units initially subject to the award on each quarterly anniversary thereafter until the award is fully vested, subject to the reporting person's continuing to provide services to the Issuer or its subsidiaries through the applicable vesting date.

Grant of restricted stock unit award under the Issuer's 2021 Incentive Award Plan. The award will vest as to 25% of the restricted stock units initially subject to the award on February 15, 2026 and as to 1/16th of the restricted stock units initially subject to the award on each quarterly anniversary thereafter until the award is fully vested, subject to the reporting person's continuing to provide services to the Issuer or its subsidiaries through the applicable vesting date.

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting person prior to the Issuer's initial public offering, do not expire.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Consists of (i) 31,147,528 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,920 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 688,623 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting person prior to the Issuer's initial public offering, do not expire.

Consists of (i) 31,147,528 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,920 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 688,623 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

This sale of shares of Class A common stock was executed pursuant to a Rule 10b5-1 plan that was entered into by the reporting persons during an open trading window. This transaction was executed in multiple trades at prices ranging from $1.75 to $1.94, inclusive. The reported price reflects the weighted average sale price. The reporting persons hereby undertake to provide upon request to the United States Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was affected.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting persons prior to the Issuer's initial public offering, do not expire.

Consists of (i) 31,147,528 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,920 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 688,623 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with the reporting person possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and the reporting person is the sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interests therein.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

This sale of shares of Class A common stock was executed pursuant to a Rule 10b5-1 plan that was entered into by the reporting person during an open trading window. This transaction was executed in multiple trades at prices ranging from $1.75 to $1.94, inclusive. The reported price reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the United States Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transaction was affected.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

LLC Units (together with one share of Class B common stock for every LLC Unit) are exchangeable for one share of the Issuer's Class A common stock. The reported LLC Units, which were acquired by the reporting persons prior to the Issuer's initial public offering, do not expire.

Represents common units of Brilliant Earth, LLC (the "LLC Units") and shares of Class B common stock exchanged for shares of Class A common stock including (i) 2,637 LLC Units and shares of Class B common stock exchanged by Mainsail Partners III, L.P. ("MP III"), (ii) 5 LLC Units and shares of Class B common stock exchanged by Mainsail Incentive Program, LLC ("MIP"), and (iii) 58 LLC Units and shares of Class B common stock exchanged by Mainsail Co-Investors III, L.P. ("MCOI").

Consists of (i) 31,147,528 shares of Class B common stock (and associated LLC Units) held by MP III, (ii) 61,920 shares of Class B common stock (and associated LLC Units) held by MIP, and (iii) 688,623 shares of Class B common stock (and associated LLC Units) held by MCOI.

Mainsail GP III, LLC ("GP III") is the general partner of MP III. MCOI is a co-investment vehicle that invests alongside MP III. GP III is the general partner of MCOI. A three member investment committee of GP III acts by a majority vote, with Gavin Turner possessing a veto right, with respect to the voting and dispositive power of the securities held by MP III and MCOI. Mainsail Management Company, LLC ("MMC") is the managing member of MIP, and Gavin Turner is the sole Manager of MMC. Mr. Turner has separately reported the transactions and reported securities reflected in this statement. The reporting persons disclaim beneficial ownership of the reported securities except to the extent of their respective pecuniary interests therein.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 2, 2024.

This transaction was executed in multiple trades ranging from $1.35 to $1.66. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Shares of Class A common stock sold by the reporting person to cover estimated tax obligations in connection with the vesting and settlement of restricted stock units. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024.

This transaction was executed in multiple trades ranging from $1.26 to $1.64. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.

Reflects the acquisition for no consideration of Class B Common Stock in connection with the vesting of Common Units.