Studies have shown that a Black Opal of average quality and size is rarer than an average one carat Diamond. Black Opal was found for the first time in 1901 in Lightning Ridge. It received its name from its discoverers because of its dark appearance.
The dark, sometimes deep black body color provides an excellent contrast to the brilliant play-of-color embedded in the dark interior and emphasizes its intensity in an incomparable way. The body color of Black Opal can range from dark grey to jet black. Usually the layer that carries the opal with play-of-color forms naturally with a layer of dark colored opal without play-of-color. Black Opals with a specific pattern (e.g. Harlequin) belong to the most expensive gemstones in the world.