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Diamond Polish

Polish influences how well light is able to pass through a diamond and is very important to a diamond's brilliance. It is necessary to select a diamond that is laboratory certified with good, very good or excellent polish. Diamonds that have poor to extremely poor polish are less brilliant because they have microscopic polish lines that blur the surface of the diamond. These polish lines reduce the amount of light that enters or exits a diamond. When selecting your diamond be aware many diamonds possess poor polish. Diamond cutters can greatly reduce labor costs by not taking time to properly polish a diamond.

Cut and Polished Diamond.

Polish terminology as seen on grading certificates:

  • P = Poor
  • Prominent heavy polish features are seen face-up at x10 magnification.The luster of the diamond is significantly affected when viewed with the unaided eye.
  • F = Fair
  • Obvious heavy polish features are seen face-up at x10 magnification.The luster of the diamond is affected when viewed with the unaided eye.
  • G or GO or GD = Good
  • Noticeable polish features are seen face-up at x10 magnification.The luster of the diamond may be affected when viewed with the unaided eye.
  • VG or VE = Very Good
  • Minor polish features are seen face-up at x10 magnification.
  • E or X or EX = Excellent
  • Ranges from no polish features to a few minute polish features that can be viewed with difficulty face-up at x10 magnification.