Black Opal 10mmBlack opal is characterized by a dark body tone which can range from dark grey to jet black. Trace elements of iron oxide and carbon are infused into this gemstone to make the dark body tone, allowing light to refract better and exude a full color spectrum. There are only few places where black opal is found. The main one is around Lightning Ridge in New South Wales, Australia. The first black opal is thought to have been found in 1877. Black opal is