Black opal is the most coveted of all opal varities. 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 its body color when viewed against a white background. Mid-grey stones are termed as semi-black.

Black opal is the most coveted of all opal varities. 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 its body color when viewed against a white background. Mid-grey stones are termed as semi-black.

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