Clarity is the first measure and addresses miscellaneous black or white inclusions. Minerals, like the carbon based diamonds, often form in conjunction with other nearby elements. Just like the stone amber entrapped ancient insects, most minerals are not pure and contain inclusions to some degree. The fewer the inclusions in diamonds, the less the light will be interfered with. The amount of interference partly depends on where within the diamond the inclusions are. Often clarity is promoted as the major measure of diamond quality. We tend to find that the other factors affect the brightness more than does clarity.
Flawless: No internal or external flaws. Extremely rare.
Internally Flawless: no internal flaws, but some surface flaws. Very rare. VVS1-VVS2
Very Very Slightly Included (two grades). Minute inclusions very difficult to detect under 10x magnification by a trained gemologist.
Very Slightly Included (two grades). Minute inclusions seen only with difficulty under 10x magnification.
Slightly Included (two grades). Minute inclusions more easily detected under 10x magnification.
Included (three grades). Inclusions visible under 10x magnification AS WELL AS to the human eye.
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