Gem-quality diamonds are evaluated and graded by their clarity, the
absence of naturally occurring internal flaws, called Inclusions, and
external flaws, called Blemishes. Inclusions and Blemishes, whether
visible to the naked eye or only under a 10X microscope, can interfere
with a diamond’s ability to optimally reflect light, thus reducing the
diamond’s brilliance, fire and scintillation. More importantly, flaws
impact beauty and desirability; there is much greater demand for a
diamond with no flaws or very few flaws.
