Almost all diamonds carry inclusions that are often naked to the visible eye. These also make diamonds unique, as no two diamonds are the same. However, these inclusions impact a diamonds clarity. The absence of inclusions or the fewer inclusions a diamond has means better clarity. Thus, the greater the clarity, the greater the value of the diamond. An internally flawless diamond has no inclusions, but these diamonds are very rare.
Diamonds with very, very small inclusions inclusions are graded VVS1 or VVS2 and cannot be seen by the naked eye. I1 to I2 diamonds have inclusions that are visible to the naked eye and are considered to be a lower grade.