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An iridescent cleavage in tanzanite
Iridescent Inclusion in Tanzanite

A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.

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Footprint-shaped iron hydroxide deposit in quartz
Shrinkage “Footprint” in Rose Quartz

A debris pattern within a rose quartz’s fracture resembles a dinosaur’s footprint.

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Pinkish orange inclusion in topaz.
Quarterly Crystal: Triplite in Topaz

The first triplite inclusion in a topaz host is examined.

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Brazilian colorless topaz with molybdenite inclusions.
Molybdenite in Topaz

An unusual host-inclusion association is revealed when cluster of crystals in a colorless topaz is discovered to be molybdenite.

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Amethyst with a large aqueous primary fluid inclusion
Large Aqueous Primary Fluid Inclusion in Amethyst

A strikingly large primary fluid inclusion with a gas bubble was seen in a Moroccan amethyst.

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Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines
Solution-Generated Pink Color Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique

Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink color were examined for this report.

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Tropidogyne flower in amber
Inclusions in Burmese Amber

Examples of Burmese amber specimens with well-preserved inclusions that have become available in recent years.

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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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1.15 ct round brilliant diamond
Chart: Inclusions in Natural, Synthetic, and Treated Diamond

Provides a visual guide to the internal features of natural, synthetic, and treated diamonds.

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Sapphires from Australia

An overview of Australia's recent significance in the production of blue sapphire.

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