Car boot sale diamond fetches £650k at auction

DiamondImage copyright Sotheby’s

A diamond ring bought at a car boot sale for £10 has been sold for £656,750 at auction in London.

The jewel was expected to fetch £350,000, but went for almost double that at Sotheby’s on Wednesday.

The owner believed the “exceptionally-sized” stone was a piece of costume jewellery when she bought it at West Middlesex Hospital in Isleworth, west London, in the 1980s.

Unaware it was a 26 carat diamond, she wore it daily for decades.

The cushion-shaped white diamond is thought to have been from the 19th Century.

Ahead of the sale, the head of the auction house’s London jewellery department, Jessica Wyndham, said: “The owner would wear it out shopping, wear it day-to-day. It’s a good looking ring.

“No-one had any idea it had any intrinsic value at all. They enjoyed it all this time.”

Ms Wyndham said the owner – who does not want to be identified – assumed it was not a genuine gemstone because it was in a “filthy” mount and it did not have the sparkle of a diamond.

It wasn’t until after 30 years of wearing the ring that the owners took it to Sotheby’s and a jeweller told them it may be valuable.

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Media captionJessica Wyndham from Sotheby’s tries the boot-sale ring on

Another eye-catching item from the Sotheby’s sale was a Cartier diamond brooch worn by Margaret Thatcher.

It was worn the day she offered her resignation as Prime Minister to the Queen.

With its geometric chevron design, the brooch was eventually sold for £81,250, having been estimated to fetch up to £35,000.

Image caption Mrs Thatcher wore the brooch on the day she left Downing St

Proceeds from that sale will be donated to charity.

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Ms Wyndham 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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