The clarity of a diamond is a reference to the existence of any flaws in the diamond. Diamonds may have flaws either in their interior (inlcusions) or on their surface (blemishes).
When diamonds are graded for clarity, the term "blemish" isn't used. All flaws, inclusions and blemishes alike, are referred to as inclusions for simplicity sake.
The Diamond Clarity Grades
Diamonds are graded for clarity using the jewelers' 10x loupe. Grades range from "F", Flawless to "I" Included, with Included grades raning from 1 to 3. "Flawless", obviously is for diamonds without inclusions (or blemishes) of any sort. "Included 3" diamonds would have blemishes and/or inclusions that are visible to the naked eye.
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