Inclusions in Natural, Synthetic and Treated Ruby
Provides a visual guide to the internal features of natural, synthetic and treated rubies.
Flux-Induced Fingerprint Patterns in Synthetic Ruby: An Update
Some manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.
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.
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.
The Chanthaburi-Trat Gem Field, Thailand
Thailand has become the world's major source of gem ruby.
Ruby in Diamond
The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.
New Synthetic Rubies Made by Professor P. O. Knischka
A new synthetic ruby is discussed.