I have heard of this happening, but it really hurt when it happened to me. A seller on ebay had a listing for a beautiful Peretti Starfish necklace. I bid on it and won. While I was waiting for it to be delivered, I got an email from a lady who has a fantastic Tiffany collection. She had also bid on the Peretti Starfish necklace. The seller emailed her with a second chance offer, claiming that I never paid for the item and offering it to her. My friend, Lisa, knew something was fishy..excuse the pun. She emailed me and we figured out this seller had duplicates. Sure enough, when they arrived, they were the worse fakes I’ve ever seen. I actually think they were painted plastic. I took plenty of pictures…We both emailed this seller, who by this time sold a third copy…She advertises an authentic Tiffany necklace. Shows the real thing in her listing, then delivers a copy. Well, all the fakes were returned, but she told us that we wouldn’t get a refund until AFTER she received a positive feedback. The third lady actually left a positive feedback. Lisa and I blew the whistle. We filed enough complaints with paypal and ebay that the seller got kicked off ebay. Only problem, no refunds..I would rather give up the refund then agree to be blackmailed. At ebay can focus their energies on a real scam artist rather then the honest sellers. Blackmail is really tacky…