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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Noncontrolling Interest [Line Items]          
Money market fund accounts included in cash equivalents $ 33,500   $ 33,500   $ 71,600
Interest income $ 800 $ 1,600 $ 3,200 $ 4,600  
Number of operating segments | segment     1    
Number of reportable segments | segment     1    
Dividends declared (in dollars per share) | $ / shares $ 0.25        
Dividends paid $ 25,000   $ 27,980 $ 1,763  
Brilliant Earth, LLC          
Noncontrolling Interest [Line Items]          
Noncontrolling interest, ownership percentage 84.90%   84.90%