Description and information about Dark (Semi-black ) opals from Lightning Ridge Australia:
The Dark Opal or also known as semi-black Opal from Lightning Ridge Australia, is from the same family as black Opal but lighter in the background color, and is usually more affordable than a black Opal. We only consider a body tone between N4 to N7 of the Australian Opal association body tone chart, to be Dark or semi-black Opal. N8 and N9, is considered to be a light Opal. The transparency of the Dark Opal is Opaque and not translucent like a Crystal Opal.
Like all Opals, the Dark Opal has a brightness between B1 to B5, and comes in many different patterns.
Find out more about Brightness and Patterns.