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  • Natural - Also known as Indented Natural.
    A natural is an inclusion that extends into the diamond from the surface. The natural can be a portion of the original surface (or skin) of the diamond (rough) or an opening left when a surface-reaching crystal is worked during polishing.
  • Needle - A thin, elongated crystal inclusion, which literally looks like a needle.
  • Nick - A small notch on a facet junction (usually on the girdle or culet).