The clarity characteristics of diamonds can be divided into internal characteristics and external characteristics according to their positions. Among them, intrinsic characteristics have the greatest influence on clarity.

Internal characteristics: point inclusions, needle-like inclusions, light-colored inclusions, dark inclusions, feather-like particles, moire, internal texture, concave primary crystal plane, whiskers, cavities and laser marks.

External features: extra facets, polishing lines, impact marks, burn marks, artificial marks, notches, scratches, surface texture, original crystal plane and edge line wear.

Moreover, the clarity of observation should pass through a magnifying glass of 10 times.

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