Ammonite beads exhibit a ribbed, spiraling pattern typical of ammonites. The coolest thing about them (in this beader's opinion) is the iridescent flash visible in most pieces. It gives you a sense that there's something exciting going on inside. These ammonite beads are full of mystery and beauty.
Ammonites are one of the best known fossils. These creatures lived in the seas until they became extinct (along with dinosaurs) a long, long time ago.