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Figure 9. The parcel of rough spinel on the left, reportedly from Tajikistan, contains pieces weighing up to 48.5 g. The seven faceted spinels on the right (9.04–28.16 ct) were fashioned from some of this rough.

Purplish Pink Spinel from Tajikistan: Before and After Cutting

Nicholas Sturman, March 1, 2009

Purplish Pink Spinel from Tajikistan: Before and After Cutting

Emerald crystals from Colombia, Afghanistan, and Zambia

Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia

D. Brian Thompson, Christian J. Bayens, Matthew B. Morgan, Taylor J. Myrick, and Nealey E. Sims, November 8, 2017

Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.

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.

Emeralds from the Ural Mountains, USSR

Karl Schmetzer, Heinz-Jürgen Bernhardt, June 1, 1991

Emeralds are again being mined in the historic district of the Ural Mountains. Physical, chemical, spectroscopic and microscopic characteristics of stones from the recent production are presented and compared with data on older samples as well as those reported in the literature.

Fracture Filling of Emeralds Opticon and Traditional "Oils"

Robert C. Kammerling, John I. Koivula, June 1, 1991

The filling of surface-reaching breaks in emeralds is a relatively common practice, for which various kinds of oils and a natural resin have historically been used.

The Biron Hydrothermal Synthetic Emerald

Robert E. Kane and Richard T. Liddicoat, Jr., September 1, 1985

A new synthetic emerald exhibits some characteristics that are distinctly different from other synthetic emeralds, such as gold inclusions.

Emeralds from the Mananjary Region, Madagascar: Internal Features

Dietmar Schwarz, June 1, 1994

Mananjary emeralds usually can be separated from emeralds from other localities by means of associations of certain mineral inclusions.

On the Identification of Various Emerald Filling Substances

Mary L. Johnson, Shane Elen, June 1, 1999

Criteria for distinguishing emerald filling substances were investigated.

The Coscuez Mine: A Major Source of Colombian Emeralds

Ron Ringsrud, June 1, 1986

The Coscuez mine, one of a number in Colombia, is rapidly gaining significance as a major source of fine emeralds.

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.

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