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Fancy black pear-shaped diamond.
Separation of Black Diamond from NPD Synthetic Diamond

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

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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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Strong Colour Zoning in Diamond Reflects Complex Growth Environment

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

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CVD synthetic diamond
CVD Synthetic Diamond with Fancy Vivid Orange Colour

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

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Natural Mixed Cape Diamond
Mixed-Type Cape Diamond

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

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Yellow Diamond
Xenotime Inclusion in Yellow Diamond

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

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Confusing, Triangular Inclusions in an Art Deco-Style Pin
Spring 1991 G&G Lab Notes

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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A Large Irradiated Green-Yellow Diamond

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

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Large synthetic moissanite with silicon carbide polytypes

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

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Black diamond with unusual colour origin

This black diamond's colour was produced by natural radiation stains, an unusual cause of colour.

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