girdle reflection See fish-eye.
girdle thickness adjustment (GTA) In weight estimation a percentage must be added or subtracted in the formula to adjust for the effect that the girdle thickness will have on the weight.
Girdle Reflection - When a diamond has a pavilion that is too shallow or flat, the girdle is seen reflected in the table. Return to Top » ...
 See also: Diamond cutting, Oval, Jewel, Melee, Glass
  
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