








历史文献清单:古代印度的钻石

在消费者的新期望中拥抱可持续发展
星期五, 五月 31, 2019 12:00 – 13:30 JCK 拉斯维加斯珠宝展 金沙会展中心 201 金沙大道 拉斯维加斯,内华达州 89169 1 楼 303 和 304 室


Studies on Tourmaline, Sapphire, Cultured Pearl, and a Reliquary of Legend…
An overview of the Spring 2019 Gems & Gemology content.
Diamonds from the Deep: How Old Are Diamonds? Are They Forever?
The age of something is fundamental. Humans, animals, wine, cars, and antiques are viewed and understood in the context of their age.

Chatoyant Quartz/Tourmaline Doublet
A unique doublet displaying a yellowish chatoyant sheen is examined by the Tokyo lab.


Low-Fe, High-V Color-Change Burmese Sapphire
The Carlsbad lab identifies a color-change Burmese sapphire with a unique chemistry profile.

Large Faceted Gahnospinel
Advanced testing helps to identify the largest gahnospinel seen at any GIA laboratory.

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