Symmetry of the diamond polishing and cutting process of the two major areas of assessment. Grades on behalf of a diamond polishing the surface of all Facet state, and the symmetry of the diamond grading including the proportion of precision, balance and carved the face of the diamond should be accuracy. Good polishing will release the most glorious and fire. And good symmetry can make the diamond brilliance, fire and scintillation to achieve perfect balance. Polish and symmetry grades are clearly listed in the GIA and AGS guarantee book.
Such as to find the most beautiful diamonds, look for GIA excellent polish and symmetry grade (EX), very good (VG), or good (G diamond grading); or AGS polish and symmetry grades ideal (ID), a very good (EX), very good (VG), or good (G) diamond rating. There can be avoided as far as possible (F) or poor (P) polish and symmetry grades of diamonds, because of the proportion or Facet asymmetry may seriously affect the light in the direction of the diamond with the conduct, thereby affecting the diamond glory.
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