ruby

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ruby

ruby precious stone, the transparent red variety of corundum , found chiefly in Myanmar, Thailand, and Sri Lanka and classified among the most valuable of gems. The Myanmarese stones are blood red, the most valued tint being the "pigeon's blood." The Thai stones are darker and the Sri Lankan stones lighter than the Myanmarese specimens. Star rubies, i.e., those that show an internal star-shaped formation when cut in cabochon (with a rounded top), are rare. Synthetic rubies are manufactured by the fusion of pure aluminum oxide. Chromium oxide is added to provide the appropriate color.

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ruby

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

ruby Gem variety of the mineral corundum (aluminium oxide), whose characteristic red colour is due to impurities of chromium and iron oxides. The traditional source of rubies is Burma. Today, synthetic rubies are widely used in industry.

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ruby

The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

ruby XIV. — OF. rubi (mod. rubis) — medL. rubīnus, sb. use of adj. f. base of L. rubeus, ruber RED.

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T. F. HOAD. "ruby." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 20 Dec. 2009 <http://www.encyclopedia.com>.

T. F. HOAD. "ruby." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (December 20, 2009). http://www.encyclopedia.com/doc/1O27-ruby.html

T. F. HOAD. "ruby." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved December 20, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-ruby.html

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