The listing, Art nouveau silver and mother of pearl pin has ended.
You are bidding on a really unusual "art nouveau" type pin. It is silver in color, but I don't believe it's sterling since I can't find any marks on it. It feels "better" than pewter and not as soft as pewter, so maybe a base metal alloy? The white stone is mother of pearl and the pics don't do it justice. I took them with and without flash to try and get the detail. It's quite lovely.