Gemmological Characterisation of Sapphires from Yogo Gulch, Montana
A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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.
Examination of Three-Phase Inclusions in Colourless, Yellow and Blue Sapphires from Sri Lanka
Three-phase inclusions in untreated natural colourless, yellow and blue sapphires from Sri Lanka were found to consist of liquid and gaseous carbon dioxide as well as needle-like to tabular crystals of diaspore.
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.
Sapphires from Australia
An overview of Australia's recent significance in the production of blue sapphire.
Sapphire from the Mercaderes-Río Mayo Area, Cauca, Colombia
An important source of gem-quality sapphire and its inclusions is found in Colombia.
This article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
The history of the Kashmir mines, the beautiful sapphires found there and the outlook for the future.
The Chanthaburi-Trat Gem Field, Thailand
Thailand has become the world's major source of gem ruby.
Heat Treating Corundum: The Bangkok Operation
An overview of the potential effects that heat treatment can have on corundum.