A 26-carat diamond ring just sold for almost $850,000 at a London auction Wednesday and, while that’s certainly no record for expensive jewels, this particular diamond in the rough was first bought at a flea market for just $13 in the 1980s.

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The buyer, who asked Sotheby's auction house to remain anonymous, thought the gem was a piece of costume jewelry.

The auction house estimated the ring's value last month at close to $450,000 and it sold for almost twice that.

The ring was originally cut in a cushion shape by 19th century standards, according to Sotheby's, without the brilliant cut of today's diamonds. So it would have been easy to mistake it for a fake stone.

The buyer has not been identified.

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Stacey Abrams speaks at a rally for Vice President Kamala Harris at Georgia State University’s convocation center in Atlanta on Tuesday, July 30, 2024. Abrams is at the center of speculation over whether she will mount a third campaign for governor. (Hyosub Shin/AJC)

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