Tucson: A Showcase of Coloured Gemstone Innovation
An overview of the Spring 2016 Gems & Gemology content.
Garnets, Sapphires, Opals and Tarnish on High-Purity Gold
An overview of the Winter 2015 Gems & Gemology content.
Trapiche and More...
Colombia’s unique trapiche emeralds exert a fascination for many gemmologists.
Classifying Emerald Clarity Enhancement at the GIA Gem Trade Laboratory
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
This article focuses on Colombian emeralds and gives a detailed explanation of the oiling process as observed by the author.
Abstracts; Summer 2009
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
The finest and rarest emeralds are sometimes said to have an optical effect called gota de aceite.