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Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

Russell Shor, February 1, 2016

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

Three pieces of labradorite with yellow, blue and green flashes of color.

Article

Optical Effects of Phenomenal Cabochons

Sharon Bohannon, November 11, 2016

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

Article

Star Opal

Wasura Soonthorntantikul, June 27, 2014

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

Star Opal

Wasura Soonthorntantikul, July 25, 2014

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

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

Robert Raymond Coenraads and Alfonso Rosas Zenil

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

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Winter 2009

Brendan M. Laurs, Thomas W. Overton

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

Water Immersion Reveals Dye in Fire Opal

Larry Tai-An Lai, October 17, 2013

A simple test easily detected dye treatment in fire opal.

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