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Twenty-six peridot samples from the Esquel pallasite meteorite and 27 samples from 10 terrestrial sources were studied by laser ablation–inductively coupled plasma–mass spectrometry (LAICP- MS). Among ...

Since Robert Crowningshield's discovery in the late 1950s that diamonds that have been artificially colored by irradiation and subsequent annealing could be identified by their characteristic ...

This article examines the sophisticated techniques and equipment currently used to fashion a polished gem from a rough diamond. The basic manufacturing techniques— sawing, bruting, blocking, and ...

Following up on Nassau's 1981 article on the technical aspects of heat treating ruby and sapphire, the author reports his personal observations of the actual heat treatment process in Bangkok. He ...

Visit us at the Bangkok Gems & Jewelry Fair to learn what’s new at GIA and take advantage of quick, convenient gem identification and origin identification services for colored stones at our onsite ...

Visit us at the 70 th Bangkok Gems & Jewelry Fair to learn what’s new at GIA and take advantage of quick, convenient gem identification and origin identification services for colored stones at our ...

Data for global annual rough diamond production (both carat weight and value) from 1870 to 2005 were compiled and analyzed. Production statistics over this period are given for 27 diamond-producing ...

Emerald, the birthstone for May, has been beloved for millennia, evoking rebirth and renewal. Widely regarded as the definition of green, emerald is the perfect color for spring. From the poetic ...

You need access to the trusted data that appears on GIA grading and analysis reports in a reliable and secure manner. Customers today demand that the information they use to inform their purchasing ...

*重量が0.15カラット未満のカラーダイヤモンドのサービスは、ニューヨークでのみご利用いただけます **0.85カラットのダイヤモンドの場合の価格 **カラーダイヤモンド起源レポートには ...

红色柘榴石历史悠久，但现代宝石买家可以选择的颜色更丰富：绿色、橙色、橙粉色、深度饱和的紫红色，甚至还有蓝色。 红色柘榴石是最常见、使用最广泛的宝石之一。 但并不是所有的柘榴 ...