Following three years of development, Sumitomo Cement Co. of Tokyo has filed patents for what is thought to be the first synthetic cat's-eye chrysoberyl.
A beryllium oxide base is dissolved under strictly controlled conditions with a "brilliance-producing additive" at 2000 degrees Celsius to produce a single crystal.
According to a leading Japanese gemologist, the product duplicates the properties of the finest grade of natural cat's eye chrysoberyl.
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- Northwest Gemological Laboratory
- Northwest Gemological Laboratory, Inc. (NGL) is the Pacific Northwest's leading independent appraiser of fine jewelry and gemstones, with state-of-the-art facilities in Bellevue, Washington. Our Graduate Gemologists adhere to the highest gemological standards in the industry, without ethical compromise.
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