a cut intended to enhance the brilliance of a gem with the least possible sacrifice of weight, characterized by a form resembling two pyramids set base to base, truncated so as to give a broad table and a very small culet, and having from 18 to 104 facets, 58 being typical.
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Origin of brilliant cut
First recorded in 1705–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019