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Titanium-coated tanzanite
Titanium-Coated Tanzanite

For the first time, GIA's laboratory has examined tanzanite color-coated with titanium.

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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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G-Color 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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CVD Synthetic Round Brilliant
Round CVD Synthetic Diamond Over 1 Ct Identified in Hong Kong Lab

Advances in CVD growth technology have resulted in crystals that yield well-proportioned round brilliant cuts.

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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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146736-SP13-LN
Green Diamond Treated with Radioactive Salt

The stone owes all of its green color to these shallow radiation stains.

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1.50 ct Fancy Dark gray CVD synthetic diamond
Two Fancy Dark Gray CVD Synthetic Diamonds

Examination of two CVD synthetic diamonds with an unusual Fancy Dark gray color.

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Article
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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Fancy-Colored Diamonds
Diamond, Artificially Irradiated and Coated Brown

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

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