The opals in this collection come from Lightning Ridge, Australia. This collection only contains solid Australian opal because it is the finest opal in the world. There is an equal importance that Lightning Ridge Opal is mined in an environmentally and socially sensitive manner, to preserve the natural beauty of the outback all mines are returned to their natural state, and the miners are individuals not corporations who operate in an ethical and safe manner. The amazing body tones, ranging from black to crystal to light white, make incredibly fine pieces of jewelry - especially when set with diamonds. This collection will only contain natural opals from an identifiable source. When you view the Lightning Ridge Collection, you can be sure the opals are natural, non-treated, ethically mined and sourced from Lightning Ridge, Australia.