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Reference.org
Carbon flaw
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<p>A carbon flaw is a blemish present within a <a href="/facts/Diamond/IBUdnd1y">diamond</a> crystalline form of <a href="/facts/Carbon/ukrgQexo">carbon</a>, usually seen as a black spot. The blemish may be microscopic or visible to the naked eye. The spots are undesirable imperfections since they can be seen more easily than other flaws. While diamonds are composed of purely carbon, the black spot flaws could be other inclusions (foreign matter) such as olivine, garnet, pyrite, silica, calcite, and iron oxides. </p>