A diamond ring bought at a car boot sale for £10 has sold for more than half a million pounds at auction.
The 26.27 carat, cushion-shaped gem went under the hammer at Sotheby's in London for a whopping £656,750.
The "Tenner" diamond, as it has been labelled, was expected to fetch around £350,000.
In fact the person thought it was a piece of decorative costume jewellery.
It is believed the jewel was cut in the 19th century but its history and how it arrived is unknown.
However the Gemological Institute of America (GIA) confirmed it was as a genuine diamond.
There was another highlight in the Sotheby's sale in the form of a Cartier diamond brooch which went for more than twice its estimated value.
This item was worn by Margaret Thatcher on a number of high-profile public occasions, including the day she offered her resignation as Prime Minister to the Queen.
It has a geometric chevron design, which piqued the interest of buyers and was sold at £81,250.
It had first been estimated to fetch between £25,000 to £35,000.
Proceeds from this sale are to be donated to the Endeavour Fund - a charity which supports the recovery of wounded, injured and sick servicemen and women.
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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