Diamond Polish: The Finer Touches That Make A Difference.

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

Generally the polish of a diamond donít 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.

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