Diamond's Polish and Symmetry

Under finish on the diamond report, you will find an evaluation of the diamond's polish and symmetry. Polish serves as an indicator of the care taken by the cutter. The quality of the stone's polish is a factor that can not be ignored in evaluating the overall quality of a diamond, as well as its cost and value. Polish can be described on the report as excellent, very good, good, fair, or poor. The price per carat should be less on diamonds with "fair" or "poor" polish. Cost per carat is usually more for diamonds that have "very good" or "excellent" Polish.
Symmetry describes several factors:

How the facet edges align with one another;
whether or not the facets from one side of the diamond match corresponding facets on the opposite side;
whether or not facets in the top portion of the diamond are properly aligned with corresponding ones in the bottom portion.

When the symmetry is described as "fair", or worse, something is out of line.
When evaluating symmetry, the most important area to check is the alignment of the crown (top) to the pavilion (bottom). If it is not good, it will make a visual difference in the beauty of the stone, and correspondingly in its price. To check for proper alignment here, simply look at the diamond from the side to see whether or not the facets just above the girdle align with the facets just beneath the girdle.

When the top and bottom facets do not line up, it indicates sloppy cutting and, more important, the overall beauty of the diamond's is diminished. This will reduce the price more than other symmetry faults.

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