I don’t mind at all...
The cost for resizing was about $175 not including tax. I needed it one size bigger. It is an Elsa Peretti Band with a small diamond which currently sells for about $1300 (I bought it for $500 years ago). I’m located in NY. When I brought the ring in, the very nice customer service rep examined it to make sure it was genuine and then took my info. She didn’t ask for any proof of purchase. I did tell her that I bought the ring years ago and it no longer fit. She was very nice, took my information and had me sign a service agreement. I was told that it would take about two weeks time and they would contact me when it is ready for pick up.
Hope that helps... Good luck!
** Also, I recently had my engagement ring (it was not purchased from Tiffany’s) resized at my local jeweler. It was also platinum, but a much thicker band. It costed $225 (tax NOT included). Since this ring was from Tiffany’s and the pricing was comparable, I felt more comfortable bringing it back.