the importance of diamond cut
Diamond cut refers to the angles and proportions of a diamond. Based on scientific formulas, a well-cut diamond will internally reflect light from one mirror-like facet to another and disperse and reflect it through the top of the stone. This results in a display of brilliance and fire. Well-cut diamonds are therefore placed higher on the Diamond Quality Pyramid than deep or shallow-cut diamonds and a well-cut diamond is more valuable.
The cut of a diamond is what determines how the light that enters the diamond is reflected and therefore how much fire and brilliance the diamond will exude. A diamond that is cut too shallow with respect to its width will allow too much light to pass straight through the diamond, leaving little light to reflect. Such a diamond will appear dull and lacking in brilliance. Alternatively, a diamond that is cut too deeply will allow light to escape from the sides of the diamond and also appearing dull.
When a diamond is cut to proper proportions, light is reflected from one facet to another and then dispersed through the top of the stone. Within the Well Cut standards are the sub categories of Ideal, Excellent, and Very Good.
When the cut of a diamond is too shallow, light escapes through the pavilion before it can be reflected.
When the cut of a diamond is too deep, some light escapes through the opposite side of the pavilion.
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