brilliant cut

noun Jewelry.
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.

Origin:
1705–15

brilliant-cut, adjective
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Main Entry:  brilliant cut
Part of Speech:  n, adj
Definition:  a circular shape for diamonds and other gemstones with two multi-faceted pyramids placed base to base, the upper, usually with 56 facets, truncated comparatively near its base by the table, the lower, usually with 24 facets, having only the apex cut off to form the culet around which eight extra facets are sometimes added; also written brilliant-cut
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Encyclopedia Britannica
Encyclopedia

brilliant cut

method of faceting a diamond to take best advantage of the optical properties of the stone and produce a finished gem with the maximum fire and brilliancy. It is the most popular style of faceting for diamonds. A brilliant-cut stone is round in plan view and has 58 facets, 33 of which are above the girdle (the widest part of the stone) and 25 of which are below. When the stone is cut so that the facets of the crown (above the girdle) make an angle of 35 to the plane of the girdle and those of the pavilion (below the girdle) an angle of 41, the maximum amount of light entering the crown will be reflected back through the crown by the pavilion, and the diamond will possess its maximum brilliance and a high degree of fire

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
New brilliant cut techniques for the diamond made it sparkle at candlelit gatherings.
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