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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

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

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59.88 ct Fancy Vivid yellow irradiated diamond
Very Large Artificially Irradiated Yellow Diamond

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

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4.29 ct color-treated Fancy brown-pink diamond
Treated Pink Type IIa Diamond Coloured by Red Luminescence

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.

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Natural Fancy pink diamond with apparent HPHT synthetic growth structure.
Treated Pink Diamond with HPHT Synthetic Growth Structure

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

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HPHT-processed yellow rough diamond.
Yellow HPHT-Processed Rough Diamond

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

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

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

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Irradiated CVD Synthetic Diamond
Heavily Irradiated CVD Synthetic Diamond

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

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Fancy-Coloured Diamonds
Diamond, Artificially Irradiated and Coated Brown

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

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146725-SP13-LN
Large HPHT-Treated Fancy Pink Diamond

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

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146736-SP13-LN
Green Diamond Treated with Radioactive Salt

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

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