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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.

Pyrope-Spessartine Garnets with Unusual Colour Behaviour

D. Vincent Manson and Carol M. Stockton, December 1, 1984

Unusual colour-change garnets.

Two Notable Colour-Change Garnets

Carol M. Stockton, June 1, 1982

The gemmological properties and chemical compositions of two unusual colour-change garnets are reviewed.

The Cause of Iridescence in Rainbow Andradite from Nara, Japan

Thomas Hainschwang and Franck Notari

“Rainbow” andradite from Nara, Japan, occurs as relatively small orangey brown crystals that show attractive iridescence in almost the entire range of the spectrum.

Abstracts; Summer 1991

Dona M. Dirlam

From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.

Pastel Pyropes

Carol M. Stockton, June 1, 1988

Pyrope garnets occur in near-colourless to light orange and pink, as well as the familiar red.

Gem-Quality Grossular Garnets

D. Vincent Manson and Carol M. Stockton, December 1, 1982

The gemmological classification and identification of gem grossular garnets is examined.

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.

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