Choosing and prioritizing the diamond 4Cs come down to personal preference and how you plan to use the diamond. But in 99% of cases, you should prioritize diamond cut over everything else. Diamond color and clarity come next, often with color being a little more important. The least important diamond characteristic is the carat weight. Any diamond with the highest graded diamond cut will look better than a larger diamond with a poor cut. Diamonds are all about sparkle, which depends, primarily, on how well the diamond has been cut to reflect light.