SCHEDULE 13G/A

BRILLIANT EARTH GROUP INC

Class A common stock, $0.0001 par value per share · CUSIP: 109504100

Event date: 2026-09-30

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Mainsail GP III, LLC

  Shares: 31,786,248.00 · Class: 64.72%

• Mainsail Partners III, L.P.

  Shares: 31,098,704.00 · Class: 63.32%

• Mainsail Co-Investors III, L.P.

  Shares: 687,544.00 · Class: 1.40%

• MAINSAIL INCENTIVE PROGRAM, LLC

  Shares: 61,823.00 · Class: 0.13%

• MAINSAIL MANAGEMENT COMPANY, LLC

  Shares: 61,823.00 · Class: 0.13%

• Gavin Turner

  Shares: 31,848,071.00 · Class: 64.84%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.