I will add my bad experience to the list - they didn't want to provide any help, my issue was too hard and not part of their service. They always behaved like I was interrupting their lunch break or something!

I went to the Melbourne Australia store in June to get help with a broken earring, and they jumped at the chance to offer a replacement and were appalled at the service from over here. The customer service manager even came to me and offered his card and contact details if I ever have another problem. That is real Tiffany's service.