I don't see any marks identifying it as silver. The circle with the little c in it is a design copyright mark, and the 97 next to it would be the copyright date as in 1997. American craftsmen are not required in most states to register their maker's marks so it may be that you'll never get a positive ID on the maker especially if they didn't produce a lot. I have been making jewelry for almost forty years, have made thousands of pieces and my mark isn't in any reference sites or books. All a maker has to do regarding design copyrights is to mark the item with the a "c" in a circle, they don't have to register it.