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Aquamarine necklace
Article
Exhibition Review: Maker & Muse, Women of the 20th Century Art Jewelry

A review of the “Maker & Muse, Women of the 20th Century Art Jewelry” exhibition at Chicago’s Driehaus Museum.

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10.08 ct HPHT synthetic diamond with color equivalent to Fancy Deep blue
Blue HPHT Synthetic Diamond Over 10 Carats

Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.

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These two large synthetic diamonds were produced using HPHT growth methods by the Russian firm New Diamond Technology. The 4.30 ct specimen on the left has D color and SI1 clarity. On the right is a 5.11 ct sample with K color and I1 clarity. Photo by Wuyi Wang.
Article
Large HPHT-Grown Synthetic Diamonds Examined in GIA’s Hong Kong Laboratory

Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.

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2.51 and 3.23 ct CVD synthetic diamonds
Two Large CVD-Grown Synthetic Diamonds Tested by GIA

Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.

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Skull memento mori locket ring
Article
Exhibition Review: Treasures and Talismans: Rings from the Griffin Collection

A review of Treasures and Talismans: Rings from the Griffin Collection at the Cloisters in New York.

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Gem Mountain mining site
Article
Update on Rock Creek Sapphire Deposit

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

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two large synthetic diamonds
Large HPHT-Grown Synthetic Diamonds Examined in GIA’s Hong Kong Laboratory

Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.

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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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