I think I remember hearing about this site awhile ago, but when one of my tweeps twittered about it, I finally decided to go take a look. Zibbet is an on-line shopping venue for anyone interested in selling handmade items, supplies, vintage pieces, or fine art. Rather than charge per item listed like Ebay and Etsy or a flat-rate after 10 items like Artfire, they charge you after you make a sale. The cost is 7.5% of the sale, not including shipping charges, so you would need to figure that into the cost of selling each item of course.
From what I can tell, this site looks fairly new. I clicked around at various shops and most don't have a huge number of items listed, which suggests there aren't any super established sellers on her yet. For anyone looking to expand or start on-line jewelry sales (or other crafts) for no start up costs at all, not even to list, this might be worth checking out.