Diamond cut is the summary of a diamond’s proportions evaluated using the attributes of brilliance, fire, and sparkle. While high marks of color or clarity affect a diamond, it’s the cut that defines its proportions and ability to reflect light.
Diamond Cut Chart
The diamond cut scale is measured from poor to excellent. The quality of a diamond’s cut has a direct effect on its beauty; If a diamond is designed, cut and finished correctly, it will look much better than diamonds of higher color and clarity.
Light’s Effect on a Diamond
There are many factors that affect a diamond’s brilliance, the most important of which is its ability to reflect light:
When light enters the surface of a diamond, a portion of it is reflected back out of the table (top).
The remaining rays of light travel into the center of the diamond and bounce off its internal walls.
As light exits the diamond, dispersion causes the white light to be separated into multiple colors.
A Diamond’s Depth
Why is the depth of a diamond so important and how is it determined? Diamond depth is the height of a diamond in millimeters measured from its countertop (top) to its block (bottom). Percent depth measures the ratio of a diamond’s depth to its total width. Depth can have a significant impact on the quality of a diamond’s cut and the amount of light it reflects.
A shallow cut diamond allows light to escape from its sides instead of reflecting off its top.
This premier cut style is well-proportioned and carefully angled to achieve a luminous appearance
A diamond whose cut is too deep will look smaller than diamonds of similar carat weight
Polish & Symmetry
Diamond polish and symmetry are essential to the quality of the cut. For maximum brilliance, every facet of the diamond must be polished after the cutting process. A symmetrical diamond will have properly proportioned and aligned faces. If the faces are asymmetrical or not in their optimal shape, they will shine less.
Parts of a Diamond
A diamond is made up of five main parts that affect its shape and brightness. Knowing these terms will help you understand the important things to consider when choosing a diamond. Also, check out our diamond buying guide.
Table & Table Percentage
The tabletop of a diamond is the largest facet of the stone, including the top. The scale of the table is the ratio between the width of the upper face of the diamond and the width of the entire stone. The right ratio will give great burn and shine. To find out more about the ideal table proportions for each diamond shape, visit our diamond shapes page.
This is the top of the diamond, located above the waist and extending below the tabletop.
The crown of a diamond extends from the top of the stone (“table”) to the rim (the widest point of the diamond). The crown may consist of stepped faces or brilliant sections.
Forming the outer edge of the diamond, this is where the crown and pavilion meet and form the widest part of the diamond.
This is the part of the diamond between the crown and the pavilion, it essentially covers the width of the stone from side to side. The size of the belt represents the circumference of the diamond. The case of a diamond can be rough, polished or honed and generally does not affect the quality or appearance of the stone.
Located in the lower part of the rhombus, the pavilion is the bridge between the beam and the culet and is formed in the lower part (the culet).
Located between the beam and the culet (point), the pavilion is an integral part of the reflective properties of the stone. A well-cut pavilion will allow the maximum amount of light to reflect off the surface of the stone. A diamond that is too deep or shallow can cause light to escape from the bottom and sides, reducing its brilliance.
The smallest face of the diamond, the cube is located just below the bottom of the stone. If the diamond ends with a dot, the diamond grading report will show the value “None” for the culet designation. This small face was originally designed to protect the pavilion from the diamond, although today’s frames are generally strong enough to make it unnecessary.
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FAQ for Diamond Cut
How do I choose a diamond cut?
Diamond cut grade is based on a number of factors including symmetry, polish, brilliance and fire. For the most brilliance and beauty, only consider Round Brilliant diamonds with an Excellent cut. Ensure the symmetry and polish of the diamond are either Excellent or Very Good.
How is diamond cut grade determined?
How GIA assigns a diamond cut grade. GIA evaluates a round brilliant diamond’s cut based on seven components – brightness, fire, scintillation, weight ratio, durability, polish and symmetry – to arrive at a GIA diamond cut grade, which ranges from Excellent to Poor
What is the cheapest cut of diamond?
The cheapest diamond cuts that you can purchase are the Asscher diamond cut and the Emerald diamond cut. Asscher shapes and Emerald shapes are cheaper is because of two factors. When cutting the rough diamond, they lose more weight.
Which diamond cut looks the smallest?
The smallest looking diamonds cuts are the Asscher, princess and cushion cuts. Because of their square length-to-width ratio, these diamond cuts all have a small diameter and surface area relative to their carat weight.