• Robin Sanchez

    Black opal; red is the rarest color, blue the commonest. :O

  • Allie Hall

    I love my birthstone-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...

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