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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.

CVD-Grown Synthetic Diamond with Aggregated Nitrogen Impurities

Troy Ardon, Tara Allen, and Christopher M. Breeding

Recently, an unusual 0.94 ct Fancy yellow-brown emerald was submitted to GIA for a synthetic diamond grading report. It contained a cloud of black needle-like inclusions occurring along a plane and showed weak green transmission with fibre-optic illumination.

Orange Diamond with Unusual Colour Origin

Wuyi Wang and Ren Lu

GIA recently examined a rare orange diamond that demonstrated the complexity of diamond colour origin.

Turquoise with Fingerprint Pattern

Tara Allen and Amy Cooper, October 17, 2013

A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.

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.

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.

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.

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.

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.

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