Article Search Results

A large group of people outside on GIA’s Carlsbad, California campus.

Article

Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

Article

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.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

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

Green Opal From East Africa

John I. Koivula and C. W. Fryer, December 1, 1984

Gemmological and chemical analysis of bright green gem-quality opal from Tanzania.

Coated Fire Opal in the Chinese Market

Wen Han, Taijin Lu, Hua Chen, and Jian Zhang, October 31, 2014

An investigation of a coated fire opal recently found in the Chinese market.

New occurrence of fire opal from Bemia, Madagascar

Martina Simoni, Franca Caucia, Ilaria Adamo, and Pietro Galinetto

Twenty-two gem opals from a new volcanic deposit located near Bemia

New Deposit of Black Opal from Ethiopia

Lore Kiefert, Pierre Hardy, Tewodros Sintayehu, Begosew Abate, and Girma Woldetinsae, January 30, 2015

The Stayish mine in Ethiopia’s Wollo province has been producing black opal since 2013.

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.

Abstracts; Summer 2010

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2010 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside Gems & Gemology.

"Opalite": Plastic Imitation Opal with True Play-Of-Colour

John I. Koivula and Robert C. Kammerling, March 1, 1989

A plastic imitation opal that shows true play-of-colour was advertised as "new" and offered for sale under the trade name "Opalite" at the Gem and Lapidary Dealers Association (GLDA) Tucson show in February 1988.

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Article Search Results

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Gemstones

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