How to Differentiate Cuts of Diamonds
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.
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.
The 4C’s of a Diamond
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.
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.
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
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.