Diamond Cut




Back to 4 C's


Cut refers to the shape of a diamond and its mathematical proportions. Diamonds are cut into numerous shapes, depending upon the nature of the rough stone.  
Diamond Cuts
The next aspect of cut is the quality of the proportions. Cut, more than any other quality aspect, gives the diamond its sparkle. A diamond gets its brilliance and scintillation by cutting and polishing the diamond facets to allow the maximum amount of light to enter through its top to be reflected and dispersed back. When all the angles are correct, the light that enters is dispersed back through the diamonds top facets. When a stone is cut too shallow or too deep, light that enters through the top is allowed to escape through the bottom and does not allow the maximum beauty of the diamond to be realized.
Diamond Cuts

A diamond cutter spends years mastering his craft, learning how best to cut a rough diamond to achieve the ultimate cut with the fewest imperfections and the least loss of carat weight. The better the cut, the more valuable the diamond.

Ideal Cut
Mathematician Marcel Tolkowsky was the first to discover the exact angles to which a diamond must be cut in order to produce maximum brilliance. In an Ideal Cut, all of the light that enters the stone refracts internally from 57 to 58 precisely placed facets and disperses through the top of the diamond, producing fire and brilliance. Only a round brilliant cut diamond can achieve the proven mathematical proportions and symmetry of an Ideal Cut. However there is some question as to exactly what an "Ideal cut" in the industry.

Very Good Cut
A Very Good Diamond Cut is close to an Ideal Cut, with only slight variations in its measurements. It may achieve Ideal Cut proportions but vary in its polish or symmetry rating. Hence, a Very Good Cut diamond still creates remarkable brilliance and luster, often reflecting back the maximum amount of light if its table and depth percentages match those of an Ideal Cut.

Good Cut
A Good Diamond Cut is well proportioned and reflects back a very good amount of light.

Inferior Cut
Many diamonds are “spread” in their cut to increase carat weight when cutting from the original rough. Although you may end up with a diamond that appears larger, your sacrifice will be brilliance and fire.

Too Deep
When cut too deep, a diamond loses light out of the bottom, leaving the center of the diamond dark in appearance.

Too Shallow
When cut too shallow, a diamond loses light out of the bottom, reducing brilliance and giving the stone a dark, glassy appearance.

A diamond's cut is graded by several measurements. Its depth percentage, a measurement of the height vs. the width of the stone and its table percentage, a measurement of the diameter of the top facet of the stone vs. the stone's average width, are two key factors in determining the quality of a diamond’s cut. These percentages are detailed on the GIA Gem Trade Laboratory Diamond Grading Report or other grading laboratories that accompanies most of our store's  loose diamond.

Diamond Cuts

Diamond Shapes include Emerald, Round, Marquise, Princess, Oval, Pear and Square