Using our Research Lab, I would have to say that 'silvery jewelry' on eBay is a relatively saturated market unfortunately.
Based on data from closed or completed listings as of September 2011 the sell through rate for Link hidden: Login to view is only 32.30%. You will be competing with at least 151,954 other listings.
We do have a number of silver jewelry suppliers in our directory. Are you looking for a specific type of supplier?
Hope this helps.