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Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

Russell Shor, June 12, 2015

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

1.50 ct Fancy Dark grey CVD synthetic diamond

Two Fancy Dark Grey CVD Synthetic Diamonds

Troy Ardon and Sally Eaton-Magaña, October 31, 2014

Examination of two CVD synthetic diamonds with an unusual Fancy Dark grey colour.

Diamond, Artificially Irradiated and Coated Brown

Martha Altobelli, Paul Johnson, and Jason Darley, October 31, 2014

Examination of a diamond with a rare and highly sought-after Fancy reddish brown colour revealed that it had been irradiated and coated.

Round CVD Synthetic Diamond Over 1 Ct Identified in Hong Kong Lab

Carmen "Wai Kar" Lo, Ping Yu Poon, and Shun Yan Wong, April 30, 2014

Advances in CVD growth technology have resulted in crystals that yield well-proportioned round brilliant cuts.

UV-Reactive Opal

Troy Ardon, April 30, 2014

The first documented UV-reactive chemical treatment to make opal appear tenebrescent.

CVD Synthetic Diamond with Unusual DiamondView Image

Sally Eaton-Magaña, April 30, 2014

Deep blue fluorescence in a CVD synthetic diamond mimics patterns found in natural specimens.

Fancy Black NPD Synthetic Diamond

Paul Johnson and Kyaw Soe Moe, April 30, 2014

Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.

Titanium-Coated Tanzanite

Amy Cooper and Nathan Renfro, April 30, 2014

For the first time, GIA's laboratory has examined tanzanite colour-coated with titanium.

Assembled “Pearl” Filled with Wire

Nanthaporn Somsa-ard and Areeya Manustrong, April 30, 2014

Microradiography reveals wire fillings within a “pearl” created from two separate specimens.

Stellate zircon inclusions in vivid purple-pink morganite

Tara Allen and Nathan Renfro, January 31, 2014

Zircon clusters and other inclusions help to create an unusual vivid purple-pink morganite specimen.

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