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Confusing, Triangular Inclusions in an Art Deco-Style Pin

Spring 1991 G&G Lab Notes

March 1, 1991

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

Large HPHT-Treated Fancy Pink Diamond

Kyaw Soe Moe

The New York lab encountered another large HPHT-treated diamond that showed stronger pink colouration.

Diamond with High Concentration of Nickel

Troy Ardon, October 17, 2013

Analysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a colour-change effect.

Green Diamond Treated with Radioactive Salt

Marzena Nazz

The stone owes all of its green colour to these shallow radiation stains.

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.

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.

Black diamond with unusual colour origin

Troy Ardon, January 31, 2014

This black diamond's colour was produced by natural radiation stains, an unusual cause of colour.

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.

Article

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.

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