3X, EX-, VG+, and VG- are the actual range values used in the search:
3X = Cut, Polish, and Symmetry are all Ideal - Excellent
EX- = Cut is Excellent while Polish and Symmetry can be Excellent or Very Good, (but all 3 cannot be Excellent).
VG+ = Cut is Very Good while Polish and Symmetry can be Excellent or Very Good.
VG- = Cut is Very Good while Polish and Symmetry can be Very Good or Good (but all 3 cannot be Very Good).
