Know that even some of the Tiffany jewelry 's pieces that are stamped and signed can still be fake. I have recently come across a seller who claimed that all of the Tiffany jewelry items that they were selling were purchased by a "friend" who had a Tiffany & Co employee discount. Now honestly think about this for a moment: What person, even with a Tiffany & Co discount would buy 50 different pieces of Tiffany jewelry, in some cases 6 or 7 of the same piece, and then auction them off for $24.95? When it comes down to it, it simply doesn't add up. Genuine Tiffany's items usually come from the independent seller, ebay consigner, or estate auctioner.