Description and information about Black Opals from Lightning Ridge Australia :
The Black Opal from Lightning Ridge Australia, has a body tone between N1 to N4 of the Australian Opal association body tone chart. Only these are considered to be real a Black Opal. The transparency of the Black Opal is usually opaque and not translucent like a Crystal Opal.
The Black Opal is usually found only in Australia. Other Opals found outside of Australia that are black in body tone, are sometimes treated ( smoked ) to look like a real Australian black Opal.
Like all Opals, the Black Opal has a brightness between B1 to B5, and comes in many different colours and patterns.