I suddenly had a question about the ideal-scope.
We already know that large areas of white and pale pink are indicative of light leakage. Conversely, the absence of these features is assumed to indicate good light return.
It is possible for a diamond with no noticeable areas of white have a sufficently diffuse loss of light (i.e. not concentrated from any one point on the diamond) such that the overall light return is actually poor?

We already know that large areas of white and pale pink are indicative of light leakage. Conversely, the absence of these features is assumed to indicate good light return.
It is possible for a diamond with no noticeable areas of white have a sufficently diffuse loss of light (i.e. not concentrated from any one point on the diamond) such that the overall light return is actually poor?