
Gem Carvings, Fantasy Cuts, and Master Recutting
This year at the AGTA show, the number of booths selling skillfully carved, fantasy cut, or expertly recut items was noticeably higher than in past years.

Tucson 2020 Overview
In early February, despite the early phase of the COVID-19 outbreak, the Tucson shows were well attended and sales were brisk.




Atypical Bead Cultured Pinctada maxima Pearls Nucleated with Freshwater Non-Bead Cultured Pearls

GIA 图书馆十佳数字化文献






Color Classification and Stability of Queen Conch Pearls
Color stability experiments show that the color of Queen conch shell and pearls may shift in hue and/or saturation under X-ray radiation or short-wave UV radiation.


新矿物以 GIA 理事 Barbara Dutrow(芭芭拉·达特罗)博士的名字命名以表敬意
加利福尼亚州卡尔斯巴德 — 2020 年 2 月 26 日 – 新发现的矿物种别 Dutrowite 属于碧玺族,与 GIA 理事 Barbara L. Dutrow(芭芭拉·L.·达特罗)博士同名。


《宝石与宝石学》(Gems & Gemology) 2019 年冬季刊有色宝石原产地
加利福尼亚州卡尔斯巴德 — 2020 年 2 月 3 日 — 最新一期的 GIA 专业季刊《宝石与宝石学》(Gems & Gemology) 2019 年冬季刊集中讨论了宝石学鉴定所有色宝石地理原产地鉴定的科学原理、问题和限制。

Geology of Corundum and Emerald Gem Deposits: A Review
Over the last two decades, knowledge of the formation of gem deposits has improved significantly. This article reviews the state of our knowledge of the geology and genesis of gem corundum and emerald deposits.

Geographic Origin Determination of Emerald
The relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.

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