An alexandrite and diamond ring

centering a cushion-shaped alexandrite within a surround of old mine-cut diamonds, completed by diamond-set shoulders; alexandrite weighing approximately: 4.30 carats; estimated total diamond weight: 2.00 carats; mounted in platinum. Estimate: $12,000 - 15,000

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Bonhams.  Fine Jewelry, 14 Oct 2008. San Francisco, Los Angeles and New York - www.bonhams.com