Introduced by the Gemological Institute of America (GIA), the 4Cs is the universally grading system, whose underlying premise is that the value of a polished diamond is decided by its respective scores for carat, clarity, color and cut. But do they represent an adequate number of criteria to provide the definitive price of any given stone? Not so says gemologist Renée Newman, writing in Jewellery Business, a Canadian trade publication, in an article entitled “Diamond Evolution: Why the 4Cs is no longer an adequate pricing system – Jewellery Business.”