Article Search Results

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.

Multi-colored gems are superimposed on an image of glacier peaks.

Article

Gems and Minerals from the Sub-Arctic

Sharon Bohannon, March 17, 2017

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

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.

Article

GIA Gem Project
Garnet

Often thought of as a deep red gemstone, garnet can also be yellow, orange, green or brown – any colour except blue.

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.

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.

Gem Garnets in The Red-To-Violet Colour Range

D. Vincent Manson and Carol M. Stockton, December 1, 1981

This article shows that the characteristic of colour appears to have little correlation with variations in bulk (not trace) composition or physical properties.

A New Classification for Red-To-Violet Garnets

W. William Hanneman, March 1, 1983

An overview of previous red-to-violet garnet classification schemes and a proposal for a new one.

A Proposed New Classification for Gem-Quality Garnets

Carol M. Stockton and D. Vincent Manson, December 1, 1985

Eight garnet species are defined and methods of identification are described.

Gem Andradite Garnets

Carol M. Stockton and D. Vincent Manson, December 1, 1983

Gem-quality andradites are easy to distinguish chemically from other types of gem garnets.

Article Search Results

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Article Search Results

Types

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Gemstones

Gemstones

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G&G Winter 2019 Edition