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.
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.
Agates from Sidi Rahal, in the Atlas Mountains of Morocco
A report on the chemical and mineralogical analysis of samples’ solid inclusions.
On the Identification of Various Emerald Filling Substances
Criteria for distinguishing emerald filling substances were investigated.
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.
Emeralds of the Panjshir Valley, Afghanistan
With the withdrawal of Soviet troops from Afghanistan, villagers in the Panjshir Valley are turning their attention to the emerald riches of the nearby Hindu Kush Mountains.
The Chemical Distinction of Natural from Synthetic Emeralds
Natural and synthetic emeralds are studied to identify the chemical differences between them.
Gemstones of Pakistan: Emerald, Ruby and Spinel
This article reports on three gem materials currently being mined in Pakistan.