Ratio of two specific measurements of a diamond. This relationship is an indicator of the diamond's brilliance.

Depth- Refers to the total depth of the stone from the table, or top, of the diamond to the culet, or point. In round brilliants the range of generally accepted depth to width ratio is between 57% and 63%. (Ideal proportions are 58.9% to 61.8%.) In fancy shapes, the total depth and other proportions are not scrutinized the same way as round brilliants.



The table is the largest facet of the diamond and considered the window. In round brilliants, the range of generally accepted table to overall diameter is 53% to 66%. (Ideal proportions are 53% to 57%.) Again, in fancy shapes, the table diameter and other proportions are not scrutinized in the same way as in round brilliants.



Refers to the middle of the diamond that separates the crown, or top of the diamond from the pavilion, or bottom. The girdle generally makes up to 2%to 3% of the total depth of the stone. This can vary depending on how thin or thick the girdle actually is. Some girdles are faceted and others are granular and have a frosted appearance.



The culet is a polished facet placed at the tip of the diamond to prevent chipping. The culet ranges from none or white abraded to extremely large, which would show an octagonal outline when looking through the stone. The culet is graded through the table, with the stone face up, under 10X magnification.



The polish grading rates the surface of the diamond. This includes blemishes, which are surface characteristics such as: an abrasion, nicks, pits, polish lines, and polish marks, a rough girdle, and scratches.



This indicates how symmetrical and aligned the facets of the diamond are to one another. Factors that can affect the symmetry include the following: off center culet or table, out of round girdle, facets that fail to point properly, misalignment of crown and pavilion facets, a table that is not a rectangular octagon, misshapen facets, table and girdle not in parallel, a wavy girdle, a natural (a rut that can affect the clarity grade) or extra facets (which do not affect the clarity grade). Polish and symmetry are given the grades of Excellent, Very Good, Good, Fair, and Poor.

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