New Synthetic Rubies Made by Professor P. O. Knischka
A new synthetic ruby is discussed.
Gemstones of Pakistan: Emerald, Ruby, and Spinel
This article reports on three gem materials currently being mined in Pakistan.
Heat Treating Corundum: The Bangkok Operation
An overview of the potential effects that heat treatment can have on corundum.
Pinpoint Illumination: A Controllable System of Lighting for Gem Microscopy
A review of a very useful hand-held tool for jewelers and gemologists.
Sri Lanka: The Gem Island
An overview of the many types of gem-quality material, and its inclusions, currently found in Sri Lanka.
San Carlos Peridot
Marketed throughout the world, San Carlos material is often confused with, and sold as, peridot from localities that are better known and documented.
Ruby in Diamond
The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.
Heat Treating Ruby and Sapphire: Technical Aspects
A review of heat treatment methods available for use on natural or synthetic corundum.
Synthetic Moissanite: A New Diamond Substitute
Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.
A Chart for the Separation of Natural and Synthetic Diamonds
Exploration of a chart designed to give jewelers and gemologists a practical guide to identifying synthetic diamonds as they enter the jewelry trade.