In the late 1980s, a woman who paid £10 for a “costume” ring discovered it held a 26-carat diamond; then it sold for £656,750 in 2017

At a local car-boot sale, a woman stumbled upon a ring priced at just ten pounds. Unbeknownst to her, it was a remarkable twenty-six-carat antique diamond! The vintage cushion cut gave it a unique allure, but information gaps had muddled its true value for years. Eventually, Sotheby’s auctioned the ring for an astounding six hundred thousand pounds.
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