A Rhode Island woman bought a ceramic plate in 1970, paying less than $100 for the handsome dishware. She decided to hang it on her wall above the stove, where it collected a healthy layer of grease over the years.

Luckily, not even the slick sheen of oven grime could conceal the plate's true origins — in 2014, the woman went to have the plate appraised on the television program " Antiques Roadshow" and discovered she was the owner of a 1955 Picasso-designed Madoura plate worth $10,000.