Gemstone Guidebook Project
A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Large HPHT-Treated Blue Type IIb Diamond
A look at the color zoning exhibited by the largest HPHT-treated blue diamond graded by GIA.
宝石切磨式样-定义
在这篇综合性文章中,作者分五部分探讨了有色宝石的价值要素。第一部分和第二部分发布于《宝石市场新闻》2016 年 1/2 月刊第 1 期第 35 卷;第三部分和第四部分发布于 2016 年 3/4 月刊第 2 期第 35 卷;第五部分发布于 2016 年 5/6 月刊第 3 期第 35 卷。请注意,原文没有在标题中使用术语“刻面”。但是,本系列的主旨即是刻面宝石。
Unique Star Sapphire with Transparent Core
Uncommon Parallel Color Zoning in a Chameleon Diamond
A diamond examined in the Carlsbad lab shows chameleon coloring in an unusual pattern.
Gilalite Altered to Cuprite in Quartz
A Medusa quartz from Paraíba, Brazil, hosts a surprising inclusion.
Cabochons Fashioned from the Shell of Crassostrea Virginica
Crassostrea virginica, the so-called Eastern or American oyster, is a commercial seafood widely distributed along the east coast of the United States to the Gulf of Mexico.
Wollastonite in Devitrified Glass Imitating Horsetail Inclusions in Demantoid Garnet
Perettiite-(Y) and Tusionite Inclusions in Phenakite from Myanmar
Merelaniite Inclusions in Tanzanite
Nephrite Bracelet with Filled Cavity
Green-Blue Maxixe-Type Beryl
产自巴西的达碧兹紫水晶 (英语)
大批高温高压合成米粒钻中发现的一颗天然米粒钻 (英语)
Over the last decade, the production methods used to create synthetic diamond melee have improved substantially, along with the quality of the specimens themselves.

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