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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Mar. 18, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-40836    
Entity Registrant Name Brilliant Earth Group, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 87-1015499    
Entity Address, Address Line One 300 Grant Avenue    
Entity Address, Address Line Two Third Floor    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94108    
City Area Code 800    
Local Phone Number 691-0952    
Title of 12(b) Security Class A common stock, $0.0001 par value per share    
Trading Symbol BRLT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity Public Float     $ 0
Documents Incorporated by Reference Specifically identified portions of the registrant’s definitive proxy statement for the 2022 annual meeting of stockholders, which will be filed no later than 120 days after the end of the registrant’s fiscal year ended December 31, 2021, are incorporated by reference into Part III of this Annual Report on Form 10-K.    
Entity Central Index Key 0001866757    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   10,141,592  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   35,749,118  
Class C Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   49,119,976