Ammonite and Green Quartz NecklaceThis Ammonite and Green Quartz Necklace pairs an ancient marine fossil with a vibrant natural mineral. The design features a fossilized ammonite alongside polished green quartz, both set in sterling silver. Ammonites were spiral shelled marine mollusks that lived in Earths oceans during the Mesozoic era, and their shells became preserved through fossilization over millions of years. Green quartz is a form of silicon dioxide whose color comes from