You can post your own thread offering your jewelry in the goods section of this forum's marketplace (https://bitcointalk.org/index.php?board=51.0). Be sure to use an escrow. Cryptothrift.com might be useful for you, I havent tried it out, but it seems like an OK site. Good luck diving into bitcoin. If you have questions, you might want to go to the Beginners and Help subsection of this forum (https://bitcointalk.org/index.php?board=39.0).