Courtesy Bonhams The Hope Spinel The Hope Spinel, a 50.13 ct. octagonal-cut stone set in a 19th-century silver and gold brooch, will be auctioned at the Bonhams London Fine Jewellery Sale on Sept. 24. The stone was last sold in 1917. Bonhams estimates it will go for between $227,000 and $304,000. The Hope Spinel, a 50.13 ct. octagonal-cut stone […]
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