Have you tried Etsy? It's a well-known marketplace for selling handmade crafts and stuff.
Concerning Facebook, yes it's a great way to promote and/or sell your products on it. But first, did you setup a fan page for your business. If not, that's the first thing that needs to be done. The thing about Facebook and other social media websites is that people don't go in there specifically to buy products or services, they go there to hang out with their friends and yap. But if you create a dedicated fan page about jewelry and educating the public about them, you might draw some fans in, then once you become an authority in this field, and therefore, more trustworthy, there will be a good chance that some of the fans will convert to customers.
To get the fans in, you can advertise on facebooks. That's a good first step to draw some fans in. If they like your fan page and products, they might recommend your page to their friends, and so forth.
