If I asked you what the difference between white and black opal is, there is a chance your answer would be something like: Well the main difference must be that black Opal is black and white Opal is white, right? Well actually nothing could be further from the truth. Don't worry though you would not be the only one who would make the assumption that black Opal is entirely black and white Opal is entirely white. The colour actually refers to the body tone and not the colour of the Opal. The following Opal body tone chart gives you some idea of how the body tones can differ in the Opal world....