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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.

Star Opal

Wasura Soonthorntantikul, July 25, 2014

An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.

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.

Buff-Top Round Diamond

Siau Fung Yeung

The New York lab recently examined several diamonds with an interesting variation on the cabochon.

Diamond with High Concentration of Nickel

Troy Ardon, October 17, 2013

Analysis of Fancy Light greenish yellow diamond leads to detection of nickel, as well as an inclusion that gives a colour-change effect.