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59.88 ct Fancy Vivid yellow irradiated diamond

Very Large Artificially Irradiated Yellow Diamond

Christopher Vendrell and Paul Johnson, November 7, 2016

Examination of a 59.88 ct irradiated yellow diamond, one of the largest irradiated diamonds identified by GIA.

DiamondView image of pink diamond showing two pink spots near the edge of the table facet

Evidence of Focused Beam Irradiation in Treated Pink Diamond

Troy Ardon and Lorne Loudin, November 7, 2016

DiamondView imaging and photoluminescence spectroscopy offered evidence of focused beam irradiation in a pink diamond.

4.29 ct color-treated Fancy brown-pink diamond

Treated Pink Type IIa Diamond Coloured by Red Luminescence

Sally Eaton-Magaña, November 7, 2016

A type IIa colour-treated diamond was graded as Fancy brown-pink under daylight conditions and Fancy purplish grey under incandescent lighting, a colour change that resulted from HPHT annealing and irradiation.

Natural Fancy pink diamond with apparent HPHT synthetic growth structure.

Treated Pink Diamond with HPHT Synthetic Growth Structure

Kyaw Soe Moe and Wuyi Wang, February 1, 2016

A Fancy pink type IIa diamond showing cuboctahedral growth and greenish blue phosphorescence is shown to be a natural, treated coloured diamond.

Yellow HPHT-Processed Rough Diamond

Sally Chan, November 23, 2015

HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.

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.

Heavily Irradiated CVD Synthetic Diamond

Troy Ardon and Wuyi Wang, October 31, 2014

A look at the first CVD synthetic diamond examined at GIA that has been irradiated to a blue 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.

Green Diamond Treated with Radioactive Salt

Marzena Nazz

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

Large HPHT-Treated Fancy Pink Diamond

Kyaw Soe Moe

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

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