What is a Gem Black Opal?
How is Gem Black Opal found? Gem black opal is found in the formation of a nobby (rounded nodule) or in a seam. Lightning Ridge in Australia is the only sedimentary deposit in the world for Gem Bl...
Opal Cabochons
The term cabochon refers to a curved and polished dome. Opals are cut as cabochons and can be cut low, medium or high domed. Advantages of opal cabochons A cabochon cut allows a setting edge for t...