The cut of a diamond refers to its proportions. Of the 4Cs, the cut is the aspect most directly influenced by man. The other three are dictated by nature.
All diamonds are measured in carats. “Carat” denotes the weight of a diamond. One carat equals 0.20 grams. Taken by itself, carat weight does not determine a diamond’s value.
The farthest from colorless that a diamond's grade is, the less rare and therefore less valuable it is. Minute impurities within diamonds lend the stones subtle colored tints.