Ammolite is a very precious opal gemstone which can be found in Canada and in the Rocky Mountains of the United States. It is made from fossilized shells of a marine species called ammonites. It is a rare and valuable gemstone and can be found in colors such as gray or brown, and sometimes in shimmering colors. Being a rare stone, the average price is $150 to $325 per gram. Being a malleable and fragile stone, the procedure of processing is extremely difficult and only specialized professionals manage to obtain best results.