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Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.

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Three pieces of labradorite with yellow, blue and green flashes of color.
Article
Optical Effects of Phenomenal Cabochons

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

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Leopard Opal
Leopard Opal: Play-Of-Color Opal in Vesicular Basalt from Zimapán, Hidalgo State, Mexico

“Leopard opal” consists of vesicular basalt impregnated with play-of-color opal, and is known only from Zimapán, Hidalgo State, Mexico.

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Opal with six-rayed star
Star Opal

An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.

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Opal with six-rayed star
Article
Star Opal

An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Winter 2009

This article, from the Winter 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Water Immersion Reveals Dye in Fire Opal

A simple test easily detected dye treatment in fire opal.

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