I have a friend that sold her 30,000USD engagement ring (after she dumped her fiance and he told her he didn't want the ring back) on eBay for 16,000USD to some guy in Spain. The guy said he wouldn't just hand over that kind of money to her in "good faith" and that he'd put it in escrow and when he received the ring in the mail, the money would be hers. You know how this story ended.