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Back in the 1980s, a lady bought a ring out of a car boot for less than Dh50. Little did she know the item was an expensive piece of gem. Image Credit: Sotheby's

One woman’s junk is definitely another’s treasure.

An old ring bought at a junk sale for less than Dh50 has just been sold for several millions of dirhams at an auction.

The unusual gem that features a cushion-cut diamond was one of the items included in the Fine Jewels sale by Sotheby’s in London on Wednesday.

Dubbed the “Tenner” diamond, the ring was originally purchased for £10 (Dh47)  in the 1980s from a car boot sale by a woman, who for years thought it was just another decorative costume jewel.

The Gemological Institute of America (GIA) has recently confirmed the ring as a genuine 26-carat diamond, with an estimated value of £350,000 (Dh1.6 million).

At the sound of the hammer on Wednesday, the item fetched nearly double the pre-sale estimate at £656,750 (about Dh3.1 million or $837.000).

The ring was valued more than the Cartier diamond brooch worn by Margaret Thatcher on several public occasions, which was another highlight of the Sotheby’s sale. Thatcher’s brooch fetched £81,250, still higher than the pre-sale estimate of £25,000-35,000.