Opal is a hydrated form of silica with a water content which may range from 3 to 21% by weight, but is usually between 6 and 10%. This stone has taken the gem world by storm with it’s amazing color combinations that occur in just one stone. Our material is all Ethiopian at this time and display strong colors in a variety of patterns. In addition to our many beautiful cabs and necklaces we also have this brand new rough just waiting to have it’s potential unlocked. This piece weighs 4.71 grams, measures 24X20X11 mm and, among other colors, exhibits beautiful green, yellow, blue, and red flashes.