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A black opal and diamond ring. Photo courtesy Bonhams.

centering a cabochon black opal, surrounded by round brilliant-cut diamonds; opal weighing approximately: 5.50 carats; estimated total diamond weight: 1.80 carats; mounted in eighteen karat bicolor gold; size 5.Sold for US$ 6,250 (€4,531)

Bonhams. Fine Jewellery New York. 19 Jun 2013 - www.bonhams.com