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This fancy deep green-blue diamond was treated in a multi-step process.
Irradiated and Annealed Blue Type Ia Diamond

Examination shows that a diamond was subjected to a multi-step process in order to introduce a blue color.

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Article
Fall 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

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

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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 Colored by Red Luminescence

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

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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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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 colored 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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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 color.

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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

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

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Article
Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry 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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