A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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Gem-quality rubies and pink to purple sapphires are being recovered from the Luc Yen and Quy Chau mining regions of Vietnam.
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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.
Read MoreAn important clue in identifying natural-coloured corundum is the presence of carbon dioxide fluid inclusions.
Read MoreAn overview of Australia's recent significance in the production of blue sapphire.
Read MoreAn important source of gem-quality sapphire and its inclusions is found in Colombia.
Read MoreThis article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
Read MoreThe history of the Kashmir mines, the beautiful sapphires found there and the outlook for the future.
Read MoreThailand has become the world's major source of gem ruby.
Read MoreAn overview of the potential effects that heat treatment can have on corundum.
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