The clarity of a diamond is the same as the diamond’s purity, and is a key factor in grading a diamond’s worth. Determining a diamond’s clarity is a measure of the number and type of inclusions within the diamond and on its surface. The fewer the inclusions visible under a 10X magnifier, the higher the clarity grade which ranges from flawless to heavily included. The fewer inclusions there are, the more rare and valuable the diamond is. A diamond that is both internally and externally flawless is extremely rare, but worth every penny.