Diamond 5 has a black crystal just off the center right and
an under the table facet that may be visible without a loupe.
The worst ones are dark crystals right
under the table facet, which will look like dust specks that you just can't rub off.
Specifically, this diamond has more low to medium intensity light zones
under the table facet.
This ASET image reveals a higher degree of light leakage
under the table facet.
This diamond exhibits what we consider to be extreme low intensity light zones
under the table facet.