Separation of Black Diamond from NPD Synthetic Diamond
DiamondView is used to differentiate a Fancy black natural diamond from its NPD synthetic counterparts.
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.
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.
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.
Mixed-Type Cape Diamond
A Fancy orangey-yellow “cape” diamond featured an unexpected 480 nm band, a defect normally associated with orange colour.
Xenotime Inclusion in Yellow Diamond
Presents what is believed to be the first report of a xenotime inclusion in gem-quality diamond.
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.
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.
Large synthetic moissanite with silicon carbide polytypes
Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.
Black diamond with unusual colour origin
This black diamond's colour was produced by natural radiation stains, an unusual cause of colour.