Photoluminescence Spectra of Emeralds from Colombia, Afghanistan and Zambia
Compares PL spectroscopy data of 48 emerald samples from three countries to evaluate the usefulness of the technique in geographic origin determination.
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.
Emeralds from the Ural Mountains, USSR
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"
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
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
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
Criteria for distinguishing emerald filling substances were investigated.
The Coscuez Mine: A Major Source of Colombian Emeralds
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
An overview of the plentiful and various gem materials being discovered and produced in Afghanistan.
The Separation of Natural from Synthetic Emeralds by Infrared Spectroscopy
The technique is nondestructive and, with Fourier transform instrumentation, extremely rapid in comparison to most laboratory methods.