Knife-edge Girdle - A girdle of a diamond that is so thin that it can be likened to the edge of a sharp knife. Since such a girdle is easily chipped, an ideal girdle has an appreciable thickness.
Knife-edge girdle: A very thin, knife-edge like girdle on a diamond. Not very desirable, since such a girdle is vulnerable to chipping.
because these spots are especially endangered through accidental damage and while being set. Therefore this should not be taken into account when grading the width of the girdle. The step-cuts-emerald and square often have knife-edge girdles.
 See also: Proportions, Oval, Crystal, Shape, Rough
  
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