Oval Orthoceras fossil pendant set in a silver bail.

Orthoceras fossils are the fossilized remains of an ancient marine mollusk that lived approximately 400 to 500 million years ago during the Paleozoic Era. These creatures, resembling modern-day squid, had long, conical shells that, when fossilized and cut, often reveal a distinctive cross-section. They are found in various locations worldwide, with significant deposits in North Africa and parts of Europe and North America.

These fossils have been appreciated for their unique patterns and historical significance, often being fashioned into jewelry and decorative items. The natural, geometric markings within the fossilized shell lend themselves well to artistic applications, making each piece a one-of-a-kind artifact from a distant geological past. Their appeal lies in both their natural beauty and the tangible connection they offer to prehistoric life.