Where can I go to sell an expensive Cartier watch?

I have seen websites that range the price from 11K to 19K. How can I get it appraised or sell it making sure I get paid and it's a ligit transaction? I live in Los Angeles. Should I just take it to a pawn shop?|||Try http://www.jewelerslounge.com/ they do many watch appraises and will make sure that the transaction is legitimate in addition they are a watch website so you know that you are going to the right site.|||ebay