Opalized ammonite fossils are some of the most unique ... However, these are not particularly durable fossils (or gems). They’ll also be likely cut into thin pieces (to make more of them ...

According to the American Gem Trade Association, ammolite is one of the world’s rarest gemstones. Ammonite fossils have been found across the globe, but the gemstone variety has so far only been ...

Fossilised ammonite shells can be found all around the world, including on parts of Britain's coastline. But if you can't get to a beach to find some, why not start your own collection from home?

Ammonites were shelled cephalopods that died out about 66 million years ago. Fossils of them are found all around the world, sometimes in very large concentrations. The often tightly wound shells of ...

Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

Fossils found in the northern part of Hokkaido are a new type of ammonite, the once-ubiquitous spiral-shelled creatures that went extinct with the dinosaurs 65 million years ago, researchers said.