Crystal Black or Semi-black Opal is characterised by a high transparency or translucency on a dark grey body tone displaying incredibly vivid and bright colours. According to the Opal Body Tone Guide crystal black opals are identified as N4. Australian mines are the main source of this extremely precious type of opal.
Crystal black opal with bright blue-green flash.
Crystal black opal with bright blue-violet flash.
Crystal black opal with bright blue-green rolling flash
Crystal black opal with bright blue-azure flash
Wonderful semiblack opal with very bright colors and fantastic pattern
Fantastic semiblack opal displaying a stunning mix of the rainbow colours