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This aquamarine crystal showed iridescence as it is turned under a moving light source.
Mysterious Iridescence in Aquamarine

A rough aquamarine crystal shows an unexpected phenomenon.

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Bolivian ametrine crystal.
Ametrine Optical Dishes: Windows into the Effects of Crystal Structure

Optical activity is studied using a polished block of ametrine.

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Cluster of green fluorite cubes
Quarterly Crystal: Bubble in Fluorite

Reveals an uncommon fluid inclusion in fluorite.

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Dense cluster of zircon inclusions in Ethiopian sapphire
Zircon Cluster in Ethiopian Sapphire

The presence of these zircon clusters might help separate Ethiopian sapphire from other basalt-related sources.

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Gilson cat’s-eye synthetic emerald
Gilson Cat’s-Eye Synthetic Emerald

This Gilson synthetic emerald was of particular interest for its chatoyancy, produced by a network of primary flux inclusions.

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Needle-like sillimanite inclusions in ruby
Sillimanite in Ruby

Unusual needle-like inclusions in ruby were identified as sillimanite.

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Drill hole in heated pink sapphire
Drill Hole in Heated Pink Sapphire

An unexpected manmade feature is found in a pink sapphire from Myanmar.

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Rutile crystal inclusions in rock crystal quartz
Prismatic Rutile in Quartz

A rock crystal quartz displayed a large, well-formed rutile crystal inclusion under the table.

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Boulder opal with layer of lepidocrocite inclusions
Lepidocrocite in Boulder Opal

A boulder opal contained an unusual carpet of needle-like lepidocrocite inclusions along the interface between the opal and the ironstone matrix.

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Rose-like inclusion in demantoid from Madagascar
Rose in Demantoid from Madagascar

This demantoid garnet was of particular interest for a large inclusion resembling a flower.

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