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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Noncontrolling Interest [Line Items]        
Marketing, advertising and promotional costs $ 26.9 $ 30.8 $ 77.7 $ 82.6
Brilliant Earth, LLC        
Noncontrolling Interest [Line Items]        
Noncontrolling interest, ownership percentage 86.10%   86.10%