发明名称 Method for cutting ornamental transparent gemstones and products produced therefrom
摘要 This invention relates generally to a method for systematically and accurately increasing the brilliance and depth of color of a gemstone without the need to determine the pavilion and facet angles by trial and error.
申请公布号 US4083352(A) 申请公布日期 1978.04.11
申请号 US19770763404 申请日期 1977.01.28
申请人 ANDRYCHUK, DMETRO 发明人 ANDRYCHUK, DMETRO
分类号 A44C17/00;B28D5/00;(IPC1-7):B28D5/00 主分类号 A44C17/00
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