What is the effect of “Polish” and “Symmetry” Lab grades on Brilliance and Fire of diamonds ?
A common mistake about what controls the “fire” or brilliance of a diamond -This mistake is made by in-trade professionals as well !!: The “life” (brilliance & fire) of a diamond is determined mostly by the proportions and the angles of the facets and not by the “Symmetry” or “Polish” grades stated by the EGL or GIA grading reports (certificates). For example :If a diamond is cut with all facets symmetrical and the final polish of the facets (which can be notified only through a microscope) is perfect the diamond will be graded “Very Good” or better in “Polish” and “Symmetry” BUT if the the Depth% of this diamond will be 54% and the crown angle will be 22 degrees the diamond will look dull and with VERY LITTLE brilliance !!
