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Cut refers to the quality of the proportions, polish and symmetry of a diamond. Of the 4C's, the cut is the aspect most directly influenced by man, whereas the other three C’s are influenced by nature.

Quite often the cut of a diamond is confused with its shape, but it actually is about a diamond's proportions, such as its depth and width and the uniformity of its facets--all characteristics that control brilliance, durability and other features we look for in a diamond.

The brilliance of a diamond depends a lot on its cut. Whatever the shape, a well-cut diamond always reflects better light. Diamonds with perfect colour or clarity also display reduced brilliance if it’s cut poorly.

Proportions
(Importance of cut)

Diamonds are cut in many shapes but, it is the precision with which facets are polished on to a diamond, which allows it to capture light and release its brilliance and fire.

 

When a diamond is cut to ideal or proper proportions, light is reflected from one facet to another and then dispersed through the top of the stone. This results in a display of brilliance and fire.

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.

A polished diamond’s beauty lies in its complex relationship with light: how light strikes the surface, how much enters the diamond, and how, and in what form light returns to your eye.

The result is a display of three attributes. Brightness is the combination of all white light reflecting from the surface and interior of a diamond. Fire is the coloured flashes that can be seen in a diamond. Scintillation describes the sparkle of light you see in a diamond, and the overall pattern of bright and dark areas when you look at a diamond face-up.

A polished diamond’s proportions affect its light performance, which in turn affects its beauty and overall appeal. Diamonds with good proportions optimize the interaction with light, and have good brilliance, fire, and scintillation.

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