An included diamond crystal that reaches the surface of a cut diamond is called a knot.
Knots: A crystal inclusion that appears as a knot on the diamond's surface. Given that a knot inclusion may be seen with the unaided eye, diamonds with this fault are typically given a lower clarity grade.
Knots affect a diamond's overall durability in addition to being fairly obvious within the stone (and often not even requiring a magnifying to notice them).
Small flaws observed within the diamond's structure are known as inclusions. The intense pressure and heat that carbon experiences during the transformation of carbon into diamond causes the inclusions. A crucial aspect in judging diamond clarity is inclusions.
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