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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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Greenish Blue Spodumene

The unusual greenish blue color of this spodumene was the product of irradiation.

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Composite Amber with an Unusual Structure

This 9.12 gram amber composite featured a combination of natural and imitation amber, accompanied by natural and artificial insect inclusions.

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Black Diamond with Unusual Color Origin

This black diamond's color was produced by natural radiation stains, an unusual cause of color.

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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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Unusual Epigenetic Malachite Discs in Quartz

The uncommon occurrence of epigenetic malachite, as found in this quartz, can result in vivid green color.

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CVD-Grown Synthetic Diamonds, Part 3: Detection

This article provides a brief overview of methods for detecting CVD-grown synthetic diamonds.

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