X0306 4 2021-09-27 0 0001866757 Brilliant Earth Group, Inc. BRLT 0001883427 TURNER GAVIN C/O MAINSAIL MANAGEMENT COMPANY, LLC 500 WEST 5TH STREET, SUITE 1100 AUSTIN TX 78701 1 0 1 0 Class B Common Stock 2021-09-27 4 D 0 469824 D 31965771 I See footnote LLC Units 2021-09-27 4 D 0 469824 11.22 D Class A Common Stock 469824 31965771 I See footnote On September 27, 2021, the Issuer used a portion of the net proceeds from the closing of its initial public offering ("IPO") of Class A common stock to redeem common units of Brilliant Earth LLC (the "LLC Units"), at a price of $11.22 per LLC Unit (the "Redemption"). One share of the Issuer's Class B common stock for every LLC Unit redeemed was forfeited and canceled for no consideration in connection with the Redemption. Consists of (i) 458,769 shares of Class B common stock forfeited by Mainsail Partners III, L.P. ("MP III"), (ii) 912 shares of Class B common stock forfeited by Mainsail Incentive Program, LLC ("MIP"), and (iii) 10,143 shares of Class B common stock forfeited by Mainsail Co-Investors III, L.P. ("MCOI"), in each case, in connection with the Redemption. Consists of (i) 31,213,636 shares of Class B common stock (and associated LLC Units) held by Mainsail Partners III, L.P. ("MP III"), (ii) 62,051 shares of Class B common stock (and associated LLC Units) held by Mainsail Incentive Program, LLC ("MIP"), and (iii) 690,084 shares of Class B common stock (and associated LLC Units) held 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 is sole Manager of MMC. The reporting person disclaims beneficial ownership of the reported securities except to the extent of his 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. LLC Units do not expire. /s/ Gavin Turner 2021-09-28