A feather is a type of inclusion in diamond that is the result of a seperation in the crystal lattice and usually appears white. This feature is planar in nature and is most easily visible from an angle perpendicular to its plane. When viewed parallel to the plane it is much less noticeable. Feathers usually come to the surface and can be seen as a faint line in the mirror reflection of the facet. Some feathers are open at the surface, and others can be completely contained within the diamond.
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