There are many different kinds of opals in the world, but the Fire Opal is one of the most popular gems. Unlike other gemstones, the opal is actually a mineraloid because it does not have a crystal structure like most minerals. It is a hydrated form of silicon dioxide, and its unique mineralogy is what makes it come in varying colours. The Fire Opal gets its name from the vibrant yellow, orange and red colours that shines through. Opals have been mined for thousands of years, and it has been a celebrated gemstone since the bronze ages to the middle ages and it continues to be a precious gemstone today. You will be able purchase a Fire Opal for $2,300 per carat.