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'A large, diamond ring is expected to fetch £350,000 at auction 30 years after its owner paid £10 for it at a car boot sale, thinking it was a costume jewel.
The "exceptionally-sized" stone was presumed not to be real because 19th Century diamonds were not cut to show off their brilliance like today's gems.
And so the owner, unaware of its value, wore it for decades, while doing everything from the shopping to the chores
The 26.27 carat, cushion-shaped, white diamond, snapped up at a Sunday sale at the West Middlesex Hospital in Isleworth in west London in the 1980s, is going under the hammer at Sotheby's in July.
The 26.27 karat diamond ring, which is expected to fetch £350,000 at auction
The auction house's head of London jewellery department Jessica Wyndham: "The owner would wear it out shopping, wear it day-to-day. It's a good looking ring.
"But it was bought as a costume jewel. No-one had any idea it had any intrinsic value at all. They enjoyed it all this time."'
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© Telegraph Media Group Limited 2017