A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.
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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.
Read MoreAn overview of Australia's recent significance in the production of blue sapphire.
Read MoreAn overview of the potential effects that heat treatment can have on corundum.
Read MoreA review of heat treatment methods available for use on natural or synthetic corundum.
Read MoreThis article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
Read MoreAn important clue in identifying natural-coloured corundum is the presence of carbon dioxide fluid inclusions.
Read MoreAn important source of gem-quality sapphire and its inclusions is found in Colombia.
Read MoreThailand has become the world's major source of gem ruby.
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