Article Search Results

Serenity Coated Coloured Diamonds: Detection and Durability

Andy H. Shen, Wuyi Wang, Matthew S. Hall, Steven Novak, Shane F. McClure, James E. Shigley, and Thomas M. Moses

Diamonds treated using the new Serenity Technologies coating technique for inducing various “fancy” colours are reported.

Large HPHT-Treated Fancy Pink Diamond

Kyaw Soe Moe

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

Contribution to the Identification of Treated Coloured Diamonds: Diamonds with Peculiar Colour-Zoned Pavilions

Emmanuel Fritsch and James E. Shigley, June 1, 1989

Some treated yellow and blue-to-green diamonds show a peculiar colour zoning when viewed through the pavilion.

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.

Green Diamond Treated with Radioactive Salt

Marzena Nazz

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

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.

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.

Coloured Diamonds in the Aurora Butterfly of Peace Collection

The “Type” Classification System of Diamonds and Its Importance in Gemmology

Christopher M. Breeding and James E. Shigley, June 1, 2009

Knowledge of type allows gemmologists to better evaluate if a diamond might be treated or synthetic, and whether it should be sent to a laboratory for testing.

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.

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.

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Gemstones

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Gemstones

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