v3.25.1
Cover - shares
 3 Months Ended
Mar. 31, 2025
May 09, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2025  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
CIK 0001866757  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Class A Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   14,352,321
Class B Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   35,841,905
Class C Common Stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   49,119,976