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How Fine Diamonds Are Graded For Clarity And What Affects The Rating - By: Gregg Hall, 2009-01-13 A diamond is graded for clarity based on the number of flaws it has inside and out. The fewer flaws there are on it and inside and out the more valuable it is going to be. There are only a few stones that can be classified as flawless and they are of seriously high value. Most flaws on diamonds cannot be seen without a special jeweler's microscope. COMMENTS Add a comment |