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From the Earth

Black Opal Black opal is the most coveted of all opal varities and at the high end of the market, The "black" in black opal means the gem has a very dark body tone. A black opal can be crystal or opaque. The rarest colour is red, next is green and orange with blue as the most common colour. Semi-black opal has an inherent darkness in it's body colour when viewed against a white background. Mid-grey stones are termed as semi-black. About 70% of the black opals come from Lightning Ridge, mu...