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IMG - SP16 Editorial Pay Tucson 198880 300x169

Tucson: A Showcase of Coloured Gemstone Innovation

Duncan Pay, April 28, 2016

An overview of the Spring 2016 Gems & Gemology content.

Garnets, Sapphires, Opals and Tarnish on High-Purity Gold

Duncan Pay, February 1, 2016

An overview of the Winter 2015 Gems & Gemology content.

Trapiche and More...

Duncan Pay, November 6, 2015

Colombia’s unique trapiche emeralds exert a fascination for many gemmologists.

Classifying Emerald Clarity Enhancement at the GIA Gem Trade Laboratory

Shane F. McClure, Thomas M. Moses, December 1, 1999

One of the greatest concerns with emerald filling is the degree of clarity enhancement such treatment represents

The oil treatment of emeralds in Bogotá, Colombia

Ron Ringsrud, September 1, 1983

This article focuses on Colombian emeralds and gives a detailed explanation of the oiling process as observed by the author.

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.

Gota de Aceite: Nomenclature for the Finest Colombian Emeralds

Ronald Ringsrud

The finest and rarest emeralds are sometimes said to have an optical effect called gota de aceite.

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