Ammonite fossil pendants are pretty easy to come by, but to get matching earrings for a complete set that is a little more difficult. Here are a couple of wire wrapped ammonite pendants with matching earrings; they come on silk cords that can be removed and worn with on other collars, chains or cords. All these fossils come from the regions of Madagascar.
Ammonite Fossil Pendant & Matching Earrings in Beautiful Earthy colors; wire wrapped in non-tarnish brass wire
Ammonite Fossil Pendant & Matching Earrings in Striking Black; wire wrapped in non-tarnish silver wire