What’s more, because black diamonds are opaque – and, in most cases, heavily included – they cannot be graded on the GIA clarity scale. Likewise, because there is no variation in the tone and saturation of a black diamond, only the single grade term Fancy black is used. Consequently, GIA does not issue grading reports for these diamonds. Instead, GIA issues a Coloured Diamond Identification and Origin Report. In this report, such diamonds are described as Fancy black and their colour is noted as either natural or treated.