In the 1980s, a London shopper paid £10 for a diamond ring at a car boot sale; 30 years later, its 26.27-carat stone sold for £657,000 at auction

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An Isleworth woman in west London bought a ring at a car boot sale in the 1980s for £10, thinking it was just ordinary costume jewelry. After wearing it everyday for decades, she found its remarkable secret when a jeweller indicated it could be valuable. Sotheby's specialists analyzed the ring, and…