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Gemological Institute of America
1 天
秉承科学和教育传统
1960 年 GIA 出版 Diamond Dictionary(《钻石字典》),迅速成为国际行业参考图书。 GIA 鉴别出铍扩散蓝宝石和红宝石以及化学气相沉积法 (CVD) 生产的合成钻石。 GIA 推出一套切工等级,用于对 D 至 Z 颜色范围内的圆形明亮钻石进行评估。
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