Diamond Polish and Symmetry

Polish and symmetry refer to how the diamond cutter finishes the diamond.

Diamond Tips

- A diamond with Good to Very Good symmetry and polish can save up to 10% off a diamond with Excellent or Ideal symmetry or polish.

Diamond Polish and Symmetry: The Finer Touches That Make A Difference.

The criteria for grading the polish and symmetry of a diamond have remained the same since GIA introduced its grading system in the 1950’s. The polish and symmetry refers to the finish that is done after cutting the diamond.

Generally the polish and symmetry of a diamond don’t make a much difference as the diamond cut; however, these finer characteristics of a diamond can either add to or deduct from the cost of a diamond.

Polish Grading

Diamond Polish

Polish is determined by the visibility of luster and can range from Excellent down to Poor, depending on how well the diamond was finished before wearing.

Symmetry Grading

Diamond Symmetry

Symmetry refers to how well-proportioned the cut of the stone is. For instance, round diamonds should have symmetry and balance to attract the most amount of light for maximum fire and brilliance.

Price differences of diamond when polish and symmetry gradient are taken into account.

Price difference for Round diamonds
1-1.49ct, F-H, VS1-SI2, GIA and AGS
58%-63% Depth, 53%-58% Table  
Data for April, 2004
Polish & Symmetry % Price difference
Ex/Ex or Id/Id 0%
Ex/VG or Id/VG -6.5%
VG/VG -8.3%
VG/G -9.8%
G/G -11.6%

* from pricescope.com

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