Most diamonds are yellow, brown or gray and are graded by comparing their color saturation to the saturation's of known diamonds. There are also naturally colored diamonds called fancy colored diamonds. The value of fancy colors increases with the intensity of color. Colorless diamonds are what most people think of when they think of diamonds. Even when one knows what to look for in judging a diamond's color the differences in color can be very subtle and very difficult for an untrained person to detect.
Inclusions have a greater impact on a diamonds' grade and durability than do blemishes.
The rarest diamonds are flawless, absolutely free of inclusions and blemishes under 10x magnification. Imperfect diamonds are at the opposite end of the clarity scale and contain eye visible inclusions. Each diamond, as a product of nature, has a unique number and positions of inclusions. These inclusions are like fingerprints and can greatly help in identifying a diamond. CUT Cut is the human contribution to a diamond's beauty.