This pyritized ammonite is a genuine ancient fossil, that has experienced pyritization, or crystalization naturally during it's time in the earth. This ammonite is set in 14 karat yellow gold, and hangs on a paperclip chain necklace. This one of a kind fossil is 27x17mm in size. This necklace comes on a 14 karat yellow gold, 20" paperclip chain necklace.