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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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Unusual Brown Synthetic CVD Diamond
CVD-Grown Synthetic Diamond with Aggregated Nitrogen Impurities

Recently, an unusual 0.94 ct Fancy yellow-brown emerald was submitted to GIA for a synthetic diamond grading report. It contained a cloud of black needle-like inclusions occurring along a plane and showed weak green transmission with fibre-optic illumination.

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Fancy intense pinkish orange diamond
Orange Diamond with Unusual Colour Origin

GIA recently examined a rare orange diamond that demonstrated the complexity of diamond colour origin.

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Turquoise with Fingerprint Pattern

A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.

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Fancy-Coloured Diamonds
Diamond, Artificially Irradiated and Coated Brown

Examination of a diamond with a rare and highly sought-after Fancy reddish brown colour revealed that it had been irradiated and coated.

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1.50 ct Fancy Dark grey CVD synthetic diamond
Two Fancy Dark Grey CVD Synthetic Diamonds

Examination of two CVD synthetic diamonds with an unusual Fancy Dark grey colour.

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Fancy black NPD synthetic diamond
Fancy Black NPD Synthetic Diamond

Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.

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Milky white opals
UV-Reactive Opal

The first documented UV-reactive chemical treatment to make opal appear tenebrescent.

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G-Colour CVD Synthetic Diamond
CVD Synthetic Diamond with Unusual DiamondView Image

Deep blue fluorescence in a CVD synthetic diamond mimics patterns found in natural specimens.

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Baroque pearl with suspect ring
Assembled “Pearl” Filled with Wire

Microradiography reveals wire fillings within a “pearl” created from two separate specimens.

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