Korite

Korite is the largest commercial producer of ammolite. The company produces natural ammolite gemstones and jewelry. Korite is based in Calgary Alberta, Canada. The firm's sister company, Canada Fossils Ltd., provides it with ammonites and other fossils. It is a member of the American Gem Trade Association.

On September 27, 2007, an 80-million-year-old 2-feet-in-diameter fossil of ammonite made its debut at the Museum of Natural History. Neil Landman, curator, said that it became extinct 66 million years ago, at the time of the dinosaurs. Korite donated it after its discovery in Alberta.

...
Wikipedia