Created Opal (another name Galaxy Opal) is composed by silica & small portion of water. It is available in 10 colors come from White , Black , Blue, Pink ,Orange total 5 Series.It is chemically identical to natural opal, both are 100% silica, both have the same hardness, translucent , sparking and fire.The opals that we carry are a created or galaxy opal made to be compatible with COE 33 (borosilicate glass). When galaxy opals are encased in glass, their color can be enhanced and their shapes are magnified. They're a beautiful addition to glass jewelry, marbles and more. It is suitable for lampworking glass art and luxary jewellery .