Spinel, MgAl 2 O 4 (download cif), is a rare gemstone that was used to imitate rubies. The structure has face-centered cubic symmetry, and is a little heavy to understand. The general formula is AB 2 ...
Some well-known rubies have turned out to be red spinel, including the "Black Prince's Ruby" from the Imperial State Crown. The stone's name comes from the Latin "spina," meaning "thorn ...
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From Rubies, Spinels, and Alexandrites Lead the Top Lots at Sotheby's and Christie's Jewelry SalesThe crown jewel was a 10.33 Burmese ruby and diamond ring from Sotheby's ... Harry Winston dominated the lots with an exceptional pair of spinel and diamond earrings. The no-heat, no-enhancement ...
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