Fall 2015 - Volume 51, Issue 3
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Emerald cabochon with six-rayed star.
Large Star Emerald

An emerald reportedly from Madagascar is cut to show asterism, a rare phenomenon in this material.

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Petrified wood carvings and cabochons.
Thai-Myanmar Petrified Woods

The properties of petrified woods originating from various localities in Thailand and Myanmar are examined.

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Quartz cabochons with cross-shaped quartz inclusions.
Rare “Star and Cross” Quartz from Brazil

Two quartz specimens showing asterism and cross-shaped inclusions are analyzed.

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Jadeite jade and hydrogrossular garnet bangles.
A Jadeite Bangle Simulant: Hydrogrossular Garnet

Bangles submitted for identification are found to be not jadeite jade, but hydrogrossular garnet, an unusual choice for this form.

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Olive-green serpentine cabochon.
Serpentine Cabochon with Unusual Olive Green Color

A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.

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Natural red and synthetic orange rutile
Natural Faceted Red Rutile

A dark red stone is revealed to be natural red rutile, the first faceted specimen seen in the Carlsbad lab.

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Plastic bead with visible fragments of coral.
Coral Inclusions in Plastic

An orangy red plastic bead is revealed to be a composite when white coral fragments are identified by spectroscopy and gemological properties.

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Rock crystal coated with brown skin.
Coated Rock Crystal Imitation of Ruby

A coated rough rock crystal resembles a purplish red ruby.

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Synthetic cubic zirconia imitation of peridot.
Color-Change Synthetic Cubic Zirconia as Peridot Imitation

A greenish yellow material set in a ring as a peridot imitation is identified as synthetic cubic zirconia.

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Dyed and impregnated turquoise.
Impregnated and Dyed Turquoise

Natural turquoise has been subjected to dyeing and three types of impregnation.

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