In the late 1980s, roughly three decades before its true value came to light, a woman at a car boot sale in Isleworth, west London, bought a box of costume jewelry for £10. Among the bangles was a large, dull-looking cocktail ring set with a single clear stone in a tarnished mount. The stone did not sparkle the way people expect a diamond to, so she assumed it was costume jewelry and wore it for decades without a second thought, taking it shopping and treating it as an everyday piece rather than anything valuable.
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