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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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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% |

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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Details
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