Winter 2017 - Volume 53, Issue 4
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Tourmaline and calcite on Burmese ruby.
Tourmaline Crystals on Burmese Ruby

Myanmar’s Kyatpin Valley yields an fascinating gemstone association.

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Brown and black exsolution platelets of hematite and ilmenite in feldspar show colorful thin-film interference colors.
New Phenomenal Feldspar from North Carolina with Iridescent Inclusions

A deposit in North Carolina yields potassium feldspar with a phenomenon similar to Australian rainbow lattice sunstone.

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Negative crystal in Burmese red spinel.
Complex Yellow Fluid Inclusions in Red Burmese Spinel

A unique inclusion in red spinel is indicative of a Burmese origin.

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Remarkable Twinned Calcite Inclusion in Mogok Ruby

A clear example of calcite twinning is found in a ruby from the Mogok Stone Tract.

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Inclusion scene of pyrite crystals and aragonite spheres in Ethiopian opal.
Aragonite Spheres in Ethiopian Opal

Unusual inclusions are found in an opal from Ethiopia’s Wollo Province.

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Synthetic ruby overgrowth on natural sapphire seed.
Two Unusual Natural Sapphires with Synthetic Ruby Overgrowth

For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.

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Quartzite dyed to resemble ruby-in-zoisite.
Dyed Quartzite Imitation of Ruby-in-Zoisite

Beads appearing to be ruby-in-zoisite are revealed to be dyed quartzite.

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Diamond with uneven “lizard skin” surface texture.
Lizard Skin on Deformed Diamond

The surface texture of a diamond is affected by the gemstone’s structure.

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Alexandrite cabochon in fluorescent (left) and incandescent light (right).
Cat’s-Eye Alexandrite with Unique Inclusion Pattern

Examination of a chatoyant alexandrite cabochon.

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Sub-hexagonal etch pits in synthetic moissanite.
Synthetic Moissanite Imitating Rough Diamond

A light green specimen, submitted as a rough diamond, is actually a synthetic moissanite.

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