Genuine ammonite fossils with gold filled or sterling silver Hangs from an 18"/45cm chain These ammonites are some of the first invertebrates on earth and at their youngest they are 3 million years old, at their oldest they are 350 million years old. This is your chance to offer your customers the ability to wear deep time and prehistory. Please keep in mind that all gemstones are completely natural so each piece will be similar though different, reflecting the uniqueness of nature.