What a great invention! The curly wire on top is a Bailey Bail Adapter from All Wired Up Jewelry! (The round disk is to show how a pendant looks on the adapter.) It allows you put a pendant with a small bail on a large size chain, pearls, or beads! Now I can wear any of my pendants on my pearls or beads. Just what I have been looking for. Check out the web site "All wired up jewelry".