I bet eBAY response will go something like this: "Tiffany Co. go sue the individual sellers! eBAY did not make the claim that the bracelets or whatever are authentic, the sellers did. eBay provides a service allowing people to come together at one place called ebay.com to sell and buy products. Any misrepresentation is solely the responsibility of the seller."
Guess what? I agree. I think Tiffany should take the sellers to court and sue them like $1 million dollars or so in punitive damages alone and I bet some people would think twice about selling fake stuff.
People get away with selling fake stuff because no one is enforcing strict punishment.
On the other hand, I do think that eBAY should be fined for failing to investigate and resolve matters where people claimed to have been duped by scrupulous buyers. If they know and let the buyers continue to sell on their website, then eBAY too should be sued for millions.
Business like eBay doesn't care as long as they are making money, but when they get fined in the millions which will cut into profits, I bet they will do some things differently.