Most diamonds contain some inner flaws, or inclusions, that occur during the formation process. The visibility, number and size of these inclusions determine what is called the clarity of a diamond. Diamonds that are clear create more brilliance, and thus are more highly prized, and priced. When we speak of a diamond’s clarity, we are referring to the presence of identifying characteristics on (blemishes) and within (inclusions) the stone. Inclusions include flaws such as air bubbles, cracks, and non-diamond minerals found in the diamond. Blemishes include scratches, pits, and chips. Some blemishes occur during the cutting processes. Diamonds with no or few inclusions and blemishes are more highly valued than those with less clarity because they are rarer. Diamonds are graded for clarity under 10x loupe magnification. Grades range from flawless (diamonds which are completely freeof blemishes and inclusions), to included (diamonds which possess large, heavy blemishes and inclusions that are visible to the naked eye). F = flawless (rare and expensive). Vs1-vs2 = very slight inclusions. Si1-si2 = slight inclusions. P1-p4 = imperfect.