Flea market diamond ends up being worth $454K

Buyer thought $15 purchase was costume jewelry

By Josh Nichols
Sotheby's via CNN

The buyer of a $15 piece of costume jewelry wore it for 30 years before discovering it's actually a 26.26 carat white diamond.

The ring, originally bought at a flea market in the United Kingdom, is expected to fetch around $454,000 when it is auctioned by Sotheby's next month, according to The Associated Press.

The unidentified buyer was unaware of the ring's value because diamonds in the 1800s weren't cut to highlight their brilliance and clarity.

The AP reported that Sotheby's jewelry department chief, Jessica Wyndham, said the owner wore it daily, unaware of its real value.