Article Search Results

The Identification of Artificial Colouration in Diamond

Kenneth V. G. Scarratt, June 1, 1982

The source of colour in some diamonds, particularly fluorescent green and some yellow stones, can be very difficult to identify despite increasing knowledge about the radiation-related bands seen in the visible spectra of diamonds.

Strong Colour Zoning in Diamond Reflects Complex Growth Environment

Troy Ardon, GIA, July 1, 2013

A report on a 2.08 ct emerald-cut diamond graded as fancy dark orangey brown.

A Large Irradiated Green-Yellow Diamond

Wuyi Wang, Paul Johnson, and Emiko Yazawa, GIA, July 1, 2013

GIA's identification of a large diamond as artificially irradiated based on careful spectroscopic analysis and lab database review.

Large synthetic moissanite with silicon carbide polytypes

Kyaw Soe Moe, Paul Johnson, and Ren Lu, January 31, 2014

Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.

Separation of Black Diamond from NPD Synthetic Diamond

Paul Johnson and Kyaw Soe Moe, August 3, 2016

DiamondView is used to differentiate a Fancy black natural diamond from its NPD synthetic counterparts.

Identification of HPHT-Treated Yellow to Green Diamonds

Ilene M. Reinitz, Peter R. Buerki, June 1, 2000

Greenish yellow to yellowish green HPHT-treated diamonds exhibited highly saturated body colour, well-defined brown to yellow octahedral graining and visual evidence of heating, among other characteristics.

Lab-Grown Coloured Diamonds from Chatham Created Gems

James E. Shigley, Shane F. McClure, June 1, 2004

This article compares some of Chatham Created Gems’ synthetic coloured diamonds to natural diamonds and explains the results.

Bright yellow diamonds from Sierra Leone

James Shigley and Christopher M. Breeding, January 31, 2014

Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitised feather inclusions.

Xenotime Inclusion in Yellow Diamond

Kyaw Soe Moe, Martha Altobelli, and Paul Johnson , October 31, 2014

Presents what is believed to be the first report of a xenotime inclusion in gem-quality diamond.

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.

Article Search Results

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Gemstones

Article Search Results

Types

Content Type

Reviewed

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Gemstones

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