A large diamond ring purchased for £10 at a car boot sale is expected to fetch £350,000 under the hammer at Sotheby’s July auction. The ring, which was bought 30 years ago for £10 when the original owner had mistaken it for a piece of costume jewellery, has been described by Sotheby’s as a 26.27ct, cushion-shaped, white diamond stone. It is said the original owner may have thought it was a CZ due to 19th Century diamonds not being cut to show off their brilliance like today’s

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