subject: Engagement Rings - How To Find The Right One [print this page] Cut, clarity, color, and carat make up the price of your diamond. The cut is the most important of the four C's, because it is what gives your diamond it's brilliance. Clarity looks for inclusions in the diamond. Many of those imperfections are not obvious to the untrained eye. Color is graded with the clearest being the most expensive. Carat is the weight of your diamond.