0.6 Carat Natural Semi-Black Opal from Lightning Ridge Australia.
Name: Natural Semi-Black Opal
Weight: 0.6 Carat
Size: 8.3*5.25*1.8 mm
Opal Type: Natural Semi-Black Opal, NOT a doublet/triplet
Body Tone: N6
Brightness: 4 Out Of 5
Color: Multicolour
Shape: Oval
Origin: Lightning Ridge, NSW Australia
Treatment: None
Black opal refers to the opal with black or dark body tone, which is the rarest species in the opal family. On the body tone scale of the Lightning Ridge Mine in Australia, the body tone between N1 and N4 can be called black opal; the body tone between N5 and N6 is called semi-black opal; the body tone between N7 and N9 is classified as light body tone opal. In actual market transactions, black and dark body tone can be called black opals.
At present, the Lightning Ridge Mine in New South Wales Australia has always been regarded as the only origin of black opal, which is correct in the strict sense. In addition, there was also a small amount of black opal produced in the Mintabie mining area in South Australia, but the black opal produced by Mintabie and the black opal produced by Lightning Ridge are still somewhat different. Usually, the black opal produced by Mintabie is very different. It can rarely reach the black body tone of Lightning Ridge black opal, and its output is very scarce. It is quickly mined out. At present, there is basically no black opal output in this mine. In addition, as of now, no new mines have been discovered in the world.