(SOTHEBY'S/CNN) - A ring bought for about $13 at a garage sale in London in the 1980s has been valued at over $400,000.
The buyer assumed the ring was a piece of costume jewelry and only decided in the last few months to have it appraised.
Much to the owner's surprise, the ring turned out to be a genuine, cushion-shaped diamond weighing 26.27 carats.
The ring is scheduled to be sold at Sotheby's on June 7.
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