European Cut Diamond & Platinum Ring
Appraised: 2010
Value: $60,000 to $80,000, auction.
About: This massive diamond ring is a whopping 7 carats, and was made in 1925, retailing for $1,000. Interestingly, the eight-prong setting indicates that this ring was intended for a man rather than a woman. It was originally mis-graded before the owner brought it into Antiques Roadshow, where she found out it was worth up to $80k instead of just $20k.