

New Designs from Paula Crevoshay
World-renowned jewelry artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.
Three Faceted Collector Specimens
Three mineral species, not previously seen in the Carlsbad lab, are examined.

Unusual Dark Orangy Red Cordierite
A cordierite with a color not seen in the GIA lab is examined in New York.

The Role of Silicon in the Color of Gem Corundum
Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.





Pyrope-Spessartine Color-Change Garnet with a High Grossular Component
A color change in rough garnet is observed and plotted in GIA’s Carlsbad lab.

Japanese Jadeite: History, Characteristics, and Comparison with Other Sources
Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

GIA发现覆合钻石
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.






针对产自 Baw Mar 矿(缅甸摩谷)的蓝色蓝宝石的深入宝石学研究
GIA 实地宝石学家在 2013 年、2014 年和 2015 年考察过 Baw Mar 的运营。 在本次研究中,我们分析了在两个独立考察期间收集的样本。



.jpg)


