I think Tibetan silver is similar to pewter. Not sure exactly, but it's a great bracelet. I've had one myself, for quite a while and it hasn't tarnished, etc. Good luck if you decide to bid! :)
Honestly I have no idea. I'm so sorry. If you'd like to do a little research on Tibetian silver before you bid, that may be the way to go. I apologize for not knowing the answer. :/