The 26ct cushion-shaped diamond which was purchased at a car boot sale for £10, has been sold at auction for £656,750.
The jewel was expected to fetch up to £350,000 when it went under the hammer at Sotheby’s in London, but was eventually snapped up for almost twice the predicted amount.
The diamond, name the “Tenner”, was originally purchased in the 1980s and is thought to have been cut in the 19th century, but its history is unknown. The owner assumed it was a decorative costume jewel and had no idea of its value when bought.
Another highlight of the Sotheby’s sale was a Cartier diamond brooch worn by Margaret Thatcher which achieved £81,250.
Jessica Wyndham, Sotheby’s head of the London jewellery department, said: “It was a thrill to bring the hammer down on two objects which have been the subject of so much interest and attention over the last few weeks and to see that attention translate into such strong bidding competition.”
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