I need the help of an expert. How much influence should the polish and symmetry grade have on my diamond search? I had thought that I should only look for Ex polish and Ex symmetry because "cut" was the most important of the 4 Cs. Is there a difference b/t EX and VG grades of polish and symmetry? Is the difference noticeable to the naked eye, especially for a stone in the 1.5-2 ct. range? Should I just save my money and go for a VG polish/VG symmetry? Help!!!