Without question, Imperial Opal is one of the most coveted gems in the world. Imperial Opal is one of those gems that all gem collectors and connoisseurs want to acquire one day. Imperial opal was extremely popular in Imperial Russia in the 18th century and it is through this association that the gem most likely received its name. Imperial opal is said to encourage confidence and ward off bad dreams. Imperial opal is often compared to the colors of the setting sun. Imperial Opal A8 on the Mohs Scale of Hardness is a great choice for everyday wear. The color range you get from Imperial Opal lends itself to unique and personalized Jewelry. Most of the Imperial Opal available today comes from Minas Gerais, Brazil.