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trilliant cut
A trilliant cut, sometimes called a trillion or trillian, is a triangular type of gemstone cut. The cut has many variations. It may have curved or uncurved sides. The shape of the top surface, or table, also varies.
==Creation==
The trilliant cut was introduced by the Asscher brothers in Amsterdam and was later trademarked by the Henry Meyer Diamond Company of New York in 1962. Now that the patent has expired, the term "Trilliant Cut" is used to refer to all triangular shaped gems, even step cut and cabochon stones. Triangular Brilliant and Triangular Modified Brilliant are the common terms used by GIA when referring to non-branded diamonds.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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