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Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

Russell Shor, June 12, 2015

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

Faceted Cobalt-Diffused Spinel and Polished Plate Samples

Article

GIA Lab Reports on a New Cobalt Diffusion Treatment of Natural Spinel

Sudarat Saeseaw, Vararut Weeramonkhonlert, Charuwan Khowpong, Nattida Ng-Poorsatien and Supharat Sangsawong, Victoria Raynaud, and Claire Ito, June 11, 2015

Report on a new cobalt diffusion treatment of natural spinel, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

Spinel Inclusion in Spinel

Amy Cooper and Ziyin Sun, January 30, 2015

Examination of a pink-purple spinel revealed what appeared to be a spinel crystal inclusion.

This rough spinel, submitted as a diamond, displayed trigons orientated in the direction opposite to that of the crystal face.

Spinel submitted as diamond

Martha Altobelli, Paul Johnson, and Kyaw Soe Moe, January 31, 2014

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

Article

Spinel submitted as diamond

Martha Altobelli, Paul Johnson and Kyaw Soe Moe, January 31, 2014

It is a rare occurrence when a diamond simulant submitted to a GIA laboratory turns out to be a natural gemstone.

The Elahera Gem Field in Central Sri Lanka

Mahinda Gunawardene and Mahinda S. Rupasinghe, June 1, 1986

The Elahera gem field currently provides approximately 35% of the gemstones exported from Sri Lanka.

A Status Report on Gemstones from Afghanistan

Gary W. Bowersox, December 1, 1985

An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.

'Cobalt-Blue' Gem Spinels

James E. Shigley and Carol M. Stockton, March 1, 1984

Similarities between natural spinels - with intense blue colour - and synthetic material, have led to difficulties in the recognition of the natural stones by traditional methods.

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.

Abstracts; Autumn 1991

Dona M. Dirlam

This article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.

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