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Natural Mixed Cape Diamond
Mixed-Type Cape Diamond

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

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry 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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146728-SP13-LN
Buff-Top Round Diamond

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

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Opal with six-rayed star
Star Opal

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

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Diamond with High Concentration of Nickel

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

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