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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Summer 2009

This article, from the Summer 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Developing the Powers of Observation in Gem Testing

According to Richard Liddicoat, the critical thinking process necessary for gem identification can be compared to the keen detective work of a Sherlock Homes.

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Article
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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Article
Titanium-Coated Tanzanite

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

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Large Synthetic Moissanite with Silicon Carbide Polytypes

Examination of the properties of a synthetic moissanite specimen submitted as a black diamond.

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Spinel Submitted as Diamond

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

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Faceted Wurtzite from Tanzania

The rarity and value of faceted wurtzites from Tanzania are sure to draw the attention of gem collectors.

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Demantoid Garnet Fossil Pseudomorphs

In these two extremely rare specimens, demantoid garnet replaced coral and gastropod fossils.

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Scheelite and Hübnerite Inclusions in Quartz from China

A quartz specimen collected from China's Hunan province contained inclusions of scheelite and hübnerite.

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Bright Yellow Diamonds from Sierra Leone

Examination of strongly yellow diamonds from the Zimmi area of Sierra Leone revealed graphitized feather inclusions.

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