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Flea market Diamond Ring bought for $13 sells for $847,667

The 26-carat ring was first purchased in the 1980’s by an anonymous seller, who bought the jewel at a car boot sale, under the assumption it was a piece of costume jewellery.

The startling realization of the ring’s true value came decades later, when the wearer chose to have the ring appraised by a local jeweler. The ring was later identified as a cushion-shaped diamond set in a 19th century mount.

Although Sotheby’s did not name the identity of the buyer, the auction house did reveal the ring was purchased as international trade within the industry and not by a private collector.