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Meaning of brilliant cut

bril'liant cut"

Pronunciation: [key]
— Jewelry. Jewelry.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.