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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.

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.

CVD Synthetic Diamond with Fancy Vivid Orange Colour

Wuyi Wang and Kyaw Soe Moe, January 30, 2015

Strong absorptions from N-V centres were the main cause of a CVD synthetic diamond’s pinkish orange bodycolour.

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.

Mixed-Type Cape Diamond

Martha Altobelli and Paul Johnson , October 31, 2014

A Fancy orangey-yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange colour.

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.

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.

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.

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.