These Ammonite fossils are as captivating as they are rare. Their intricate spiral patterns and vibrant mineralization make each specimen a natural work of art shaped over millions of years. Pricing for ammonites depends not only on size and overall quality, but also on availability in the current fossil market—so values may fluctuate as supply and demand change.

Many people are surprised to learn that ammonites—extinct marine cephalopods from the Mesozoic Era—are closely related to modern squids, octopuses, and the Nautilus. These fascinating creatures first appeared during the Devonian Period and thrived in the world’s oceans for hundreds of millions of years before disappearing during the mass extinction that also ended the reign of the dinosaurs at the close of the Cretaceous Period, about 65 million years ago.

Each ammonite fossil is a remarkable piece of natural history—clear fossil evidence of life’s long evolutionary journey on Earth. Explore the links below to learn more and own your very own ammonite.