Josh Opperman certainly knows how to turn rejection into a golden opportunity. About six years ago, this groom-to-be returned home from work to find his Manhattan apartment empty. But at least his fiancée at that time had the decency to leave behind her engagement ring.

When Opperman tried to return it, he was told by the jeweler that he'd only get around 30% of what he originally paid for it. This experience inspired Opperman's idea to start an online marketplace called It's a now a booming business for people looking to rid themselves of their once-prized wedding jewelry. He tells Business Insider:
"People aren't weirded out or thinking about bad karma,"

"It's not like you knew where your ring came from before you bought it in a store."
Just goes to show that diamonds aren't always forever...