With a finite amount of space at the crown area, having a larger table would mean that bezel and upper girdle facets would now have less surface area and hence, dispersion decreases. To answer that question, you need to understand that fire is best observed at the bezel facets of a diamond. However, the size of the table can affect the fire dispersion properties of a diamond. In short, a bigger table doesn’t mean better looks and vice versa. This is not true because there are other factors that contribute to the overall brilliance and fire of a diamond. It is widely misconceived that a larger table percentage would make a round diamond more brilliant than one with a smaller table. The main purpose of the table facet is to refract light rays entering the diamond and to redirect reflected light rays from the pavilion facets back into the observer’s eye. For a consumer, this can easily be calculated based on the average physical measurements found in a grading report’s top left-hand side.įor fancy shaped diamonds, table percentage is computed by dividing the table width (measured at the widest part of the facet) by the width of the widest part of the stone measured in millimeters. If a diamond is round cut, gemologists can compute this value by dividing the table diameter, measured in millimeters by the average girdle diameter. So, a 60 percent table means that the table is 60 percent as wide as the diamond’s outline. In a grading report, table percentage is calculated based on the size of the table divided by the average girdle diameter of the diamond. It also happens to be the largest facet on a diamond and plays a vital role in the brilliance of the stone. The table refers to the flat facet of the diamond which can be seen when the stone is face up. Below are 2 such examples wherein diamond depth is too deep or too shallow. The pavilion facets, in particular, should be cut to correct proportions so that light rays can bounce around within the diamond and be reflected out at the proper angle to the observer’s eye.ĭark looking nailheads and unsightly fish-eye effects are consequences of bad depth proportions. The depth percentage of a diamond can be used as a telltale sign for brilliance and value (stones that are cut too deeply are usually cut to retain weight from the rough). To create optimal light return and sparkle, the ideal depth percentage of a diamond would depend on its shape and may vary based on other diamond features. When light rays enter a diamond, the depth of a diamond dictates how the light rays will travel and be reflected within it. The actual polishing of a diamond is both an art and science. In a grading report, there are normally two measurements of depth – the first is the actual depth measurement in millimeters (shown under ‘measurements’ at the top of a grading report), and the second is the depth percentage (see image above), which shows how deep the diamond is in relation to its width.
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