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If the cut of the diamond is too deep, some light will escape through the opposite sides of the pavillion and the stone will be less radiant.
Likewise, if the cut is too shallow, some light will escape through the pavillion before it can be reflected. See diagram below
Clarity | Carat | Colour
It is the cut of a diamond, above all other properties that will determine the stone's fire and brilliance. Through manipulation of a stone's facets, a diamond cutter can enhance a diamond's natural ability to reflect and refract light
When light enters a well cut diamond, it is reflected from one facet to another and then dispersed through the top of the stone. Each facet acts as a light dispersing mirror and it is this light that when reflected out of the stone, gives a diamond its sparkle.