Fall 2015 - Volume 51, Issue 3
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Rough diamond with green coloration along internal cleavage.
Rough Diamond Fragment with a Large Green Cleavage Surface

A colorless diamond crystal fragment shows an eye-visible bluish green internal induced radiation stain that developed in a near-surface environment.

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Painted glass slides create filter.
Modified Rheinberg Illumination

A lighting method modified for gemological microscopy provides false-color contrast to enhance inclusion scenes.

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Amber showing mite inclusion under shadowed transmitted and fiber-optic illumination.
Cleavage System in Pink Diamond

A Fancy Intense purplish pink diamond with a network of planar cracks and strain-induced bodycolor reveals an aesthetic geometric pattern.

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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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Trapiche structure visible in pezzottaite.
Pezzottaite Debuts as the Newest Trapiche Gem Mineral

A rare mineral acquired along the Thai-Myanmar border exhibits the distinctive six-spoke pattern associated with trapiche.

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Four cat’s-eye heliodor cabochons.
Blue Gahnite Inclusions in Cat’s-Eye Heliodor

Blue octahedral crystal inclusions within heliodor cabochons are found to be gahnite, a zinc-rich end member of the spinel group.

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Two-phase inclusions in Montana alluvial sapphires.
Glassy Melt Inclusions in Sapphires from Montana

Two-phase inclusions are investigated in alluvial sapphires from deposits in Montana.

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