Black Crystal Opal Information

A Black Crystal Opal is a unique and beautiful variation of a Black Opal. Black Crystal Opal is scarce and so unique. The base of the Opal is black, but it is translucent. A Black Crystal Opal must have a body tone of a Black Opal which is between N1 to N4.Most Crystal Opals have a body tone of N5 to N7, as very few crystals can be termed ‘black crystal’. Do not be confused about Body Tone, it is not the brightness ranking or an indication of the bottom or base of the Opal. It refers to the overall Lightness or Darkness of the Opal.Black Opals have black potch on the base, but Black Crystal Opal does not have potch on its base. They are also transparent to translucent when viewed with light coming through the Opal. Transparent Black Crystal Opals are clear and mostly clean without any potch or inclusions.Translucent Black Crystal Opals only allow some light to pass through and can have inclusions inside or a deep darker color. Opaque Opals that do not allow light to pass through are Black Opals not Black Crystal Opals.By holding a Black Crystal Opal to the light, you will notice that it is not opaque like Black Opal or White Opal and is transparent but with deep dark body tone.