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Ruby cameo ring, early 19th Century - Sotheby's.  

Centring on an oval ruby cameo carved to depict the winged profile of Medusa, to a plain fluted gold mount, size M. Estimate: 4,500 - 5,500 GBP

Sotheby's. Jewels. London | 11 Apr 2013 www.sothebys.com