Hypnotic Gems Gallery: 1 pc Premium Iridescent Ammonite Polished Fossil Specimens - 2.5" to 3" Average Size - Collecting, Display Specimens, Education and Teaching 100% Natural Polished IRIDESCENT Ammonite Fossils Average Size: 2" to 2.5" These ammonites are roughly 200 million years old! Each and every ammonite is unique and you will receive a piece similar to the image shown! Includes only authentic Hypnotic Gems fossils - Hand checked and certified by our paleontologist!