Pyritized Ammonite Necklace

This necklace features a rare, pyritized ammonite fossil from Russia. During the Jurassic period, these ammonites died in a sea that contained a high concentration of iron which caused it to react to the sulfur in the water and therefore formed the iron pyrite which replaced the ammonite cell by cell. This fossil pendant measures 15mm x 20mm. It sits in a prong setting in sterling silver and slides around an oxidized, sterling silver, foxtail chain with a length of 16" adjustable up to 18". Bead of pyrite accents the end of the extension chain.