Do you live and die by the HCA? I''ve read the usage description and warnings. I don''t understand why a GIA excellent cut grade would not score well. Is it not enough to trust that an excellent cut grade will give excellent brilliance? I am not an expert. This website seems to be filled with expert advice, but practically speaking, is it safe to believe that a diamond with an excellent cut, very good symmetry, and excellent polish will look wonderful to a commoner like myself? Thank you.