The cut determines the diamond’s light performance and its brilliance. The cut of a diamond will reflect light within, from one mirror-like facet to another, diffusing it consistently through the crown (top) of a diamond. If it has been cut too shallow and wide, the diamond will lose light through the bottom. If it has been cut too deep and narrow, the diamond will lose light through its sides.
Cut Grades
The diamond cut refers to both the shape of a diamond and the aspects – their number, size
and relative proportions – of a diamond's surface. It is the most important factor in enhancing
a diamond’s light performance.
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Excellent/Ideal
The highest quality cut. This will reflect the maximum amount of light, having incomparable brilliance and fire - showing a superior level of craftsmanship, brilliance and light.
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Very Good
This has a very good light performance. It reflects almost all of the light that enters. Less expensive than an “Ideal” cut, but still offering brilliance and spark similar to the “Ideal” cut.
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Fair Cut
Allows much of the light entering the diamond to escape through its sides or bottom, less fire and brilliance to be detected. Suitable for less than .75 carats where it differs in sparkle and is difficult to recognise
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Poor Cut
They are usually deep and narrow, or wide and shallow, they lose most of the light through the sides and bottom. A poor cut diamond may be noticeably overcast and lifeless.
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