Ammonites are an extinct group of cephalopods that entered the fossil record 400 million years ago. Inside each of their shells was a network of chambers called camerae that were filled with gas, allowing these creatures to control their buoyancy. Coupled with their hydrodynamic shells, ammonites could quickly close the gap between them and their prey.

These fossil ammonite pendants have been inlaid with different materials, highlighting the fossil's logarithmic spiral and inner structure. The inlay materials are Bumble Bee Jasper, Hackmanite, and Peruvian Blue Opal, each adding a vibrant coloring to these fossils. Each necklace is set into a fine sterling silver backing with an 18" chain.