Provides a visual guide to the internal features of natural, synthetic and treated rubies.
Read MoreSome 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.
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The authors present the mineralogical and gemmological properties of rubies found recently in the Morogoro area of Tanzania that have many features in common with rubies from Myanmar (Burma) and other comparable marble-type deposits.
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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 important clue in identifying natural-coloured corundum is the presence of carbon dioxide fluid inclusions.
Read MoreAn examination and analysis of 15 natural rubies with glass-filled cavities.
Read MoreThis article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.
Read MoreThailand has become the world's major source of gem ruby.
Read MoreThis article reports on three gem materials currently being mined in Pakistan.
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