How much would I get for pawning a silver Tiffany necklace with an aquamarine pendant?

I have a Tiffany necklace, silver with a little aquamarine pendant. Never worn, perfect condition, comes with box and information and everything. It was bought from Tiffany for $175. I've never pawned anything before, does anyone know how much I could get for it? Also, do I need to bring some sort of proof of how much I bought it for? I dont know if that effects how much they will offer me or not|||Instead of pawning it, I'd try to sell it on ebay or craigslist first as you'll not get a fair price at a pawn shop - best of luck!|||Hi, I think I would try listing it on the Gold and Silver Treasure Shop. Sign up with your yahoo ID and put it on their list for whatever you want for it. I am sure someone will buy it.