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Three light-to-medium blue carved sculptures sit in a line – from larger to smaller.

Article

Making the Cut: The Art and Science of Fantasy Carving

Sharon Bohannon, January 10, 2020

Gem cutters - whether “gem whisperers” or mathematicians - create breathtakingly artistic individual gems and sculptures.

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.

Tourmaline Termination

John I. Koivula, November 7, 2016

The blue cap termination from a tourmaline crystal was preserved and polished, yielding a unique designer gem.

Bicolor tourmaline double cabochon displaying pink and white chatoyant bands on opposite sides.

Bicolour Double-Eye Tourmaline

John I. Koivula, July 31, 2015

A tourmaline displaying different colours of chatoyancy on opposite sides of a double cabochon is examined.

Copper and tenorite inclusions in cuprian-elbaite tourmaline from Paraíba, Brazil

Franz Brandstätter and Gerhard Niedermayr, September 1, 1994

Inclusions of native copper and tenorite (CuO) were found in greyish-green elbaite from São José da Batalha, Paraíba, Brazil.

Interesting Red Tourmaline from Zambia

John I. Koivula and C. W. Fryer, March 1, 1985

A new source of red tourmaline is identified in Zambia.

Tourmaline as an Inclusion in Zambian Emeralds

John I. Koivula, December 1, 1982

A report on Zambian emeralds with tourmaline inclusions.

Sri Lanka: The Gem Island

Peter C. Zwaan, June 1, 1982

An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.

Solution-Generated Pink Colour Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique

John I. Koivula, Kevin Nagle, Andy Hsi-Tien Shen, and Philip Owens

Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink colour were examined for this report.

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.

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