Ring Bought At Garage Sale For $13 Valued Nearly $500,000

LONDON (CBS) -- A ring bought for about $13 at a garage sale in London in the 80's has been valued at up to $456,000.

The buyer assumed the ring was a piece of costume jewelry and only decided in the last few months to have it appraised.

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Much to her surprise -- the ring turned out to be a genuine cushion-shaped diamond weighing more than 26 carats.

The ring is scheduled to be sold at Sotheby's next month.