A ring with a 6.59-carat sapphire led the recent Heritage jewelry auction in Dallas, Texas, where it garnered more than three times its upper estimate. The ring centers an octagonal Kashmir sapphire between two trapezoid diamonds. The piece went for $906,250 against a $300,000 high price at the May 4 Spring Fine Jewelry Signature auction, Heritage said Wednesday. It was one of a number of pieces that soared past their upper estimates. In total, …
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