Gemmological Characterisation of Sapphires from Yogo Gulch, Montana
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
A study of the gems in ciborium from Einsiedeln Abbey
The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.
Rubies and Fancy Sapphires from Vietnam
Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.
Sapphires from Australia
An overview of Australia's recent significance in the production of blue sapphire.
Heat Treating Corundum: The Bangkok Operation
An overview of the potential effects that heat treatment can have on corundum.
Heat Treating Ruby and Sapphire: Technical Aspects
A review of heat treatment methods available for use on natural or synthetic corundum.
This article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
Carbon Dioxide Fluid Inclusions as Proof of Natural-Coloured Corundum
An important clue in identifying natural-coloured corundum is the presence of carbon dioxide fluid inclusions.
Sapphire from the Mercaderes-Río Mayo Area, Cauca, Colombia
An important source of gem-quality sapphire and its inclusions is found in Colombia.
The Chanthaburi-Trat Gem Field, Thailand
Thailand has become the world's major source of gem ruby.