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Diamond Cut

The Education

Diamond Cut

Learn why diamonds cut is (one of) the most important factors of the 4C’s of a diamond. Understand how cut impacts a diamond’s brilliance, sparkle and overall quality and how it impacts price.

Diamond cut is the summary of a diamond’s proportions evaluated using the attributes of brilliancefire, 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.

This article is about diamond cutClick here to learn about the different Diamond Shapes.

Diamond Cut

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.

Diamond Cut

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:

Reflection

When light enters the surface of a diamond, a portion of it is reflected back out of the table (top).

Reflection

The remaining rays of light travel into the center of the diamond and bounce off its internal walls.

Reflection

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.

Diamond Cut


Shallow-Cut Diamonds

A shallow cut diamond allows light to escape from its sides instead of reflecting off its top.

Ideal-Cut Diamonds

This premier cut style is well-proportioned and carefully angled to achieve a luminous appearance

Deep-Cut Diamonds

A diamond whose cut is too deep will look smaller than diamonds of similar carat weight

Diamond Cut

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.

Diamond Cut

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.

Diamond Cut

Crown

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.

Diamond Cut

Girdle

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.

Diamond Cut

Pavilion

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.

Diamond Cut

Culet

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.

Want the “too long, don’t read” version of this article? Watch this short video to learn how to cut diamonds quickly with highlights in facets, panel percentages and depth, luster and symmetry.


Diamond Search

Find your the perfect diamond for your jewelry. Order your life-changing diamond.

Exclusive Custom Jewelry

Exclusive Custom Jewelry

Do you wish exclusive custom jewelry? The masters USA Diamonds can made it for you. We have a wealth of experience in these works.



How to Buy a Diamond

Diamonds are not only rare but very unique, so it’s no surprise that not all diamonds are created equal. This can overwhelm a diamond purchase, especially for the first time. “It’s scary buying diamonds. It is easy to find beautiful diamonds and it’s harder to find one that suits your

GIA Certified Diamonds

GIA Certified Diamonds

What is GIA? The GIA (Gemological Institute of America) is a non-profit organization that develops and implements standards for evaluating the quality of diamonds and is rightfully considered the most reputable gemological laboratory in the world. GIA laboratories are located in key cities for the diamond industry: New York (USA),

DIAMOND EDUCATION

DIAMOND EDUCATION

USA Diamonds DIAMOND EDUCATION Diamond education is the understanding of the 4 C’s of diamonds (color, cut, carat, clarity) and the factors that impact diamond quality and price. Diamond Shape The shape of a diamond is one of the final features. From the shiny round to the princess’scup, we will help you
Diamond Shape

Diamond Shape

Although the brilliant round-shaped diamond has long been the most popular, many consumers prefer alternative forms, including cushions, ovals and pears, among other things. At USA Diamonds, we offer the most popular diamond forms in our search for diamonds:

Diamond Color

Diamond Color

The Education Fancy Colored Diamonds are a bold way to make your jewelry one-of-a-kind. Learn all about their rarity below.

Diamond Clarity

Diamond Clarity

How pure is the diamond? Diamond clarity is a rating on the Perfect to Inclusive scale, which measures the amount and location of impurities in a diamond. Inclusion is an internal or external characteristic or defect that occurs during the natural formation of the terrestrial diamond. Most diamonds contain impurities

Diamond Fluorescence

Diamond Fluorescence

When UV light hits a diamond with fluorescent properties, the stone emits light. Most often blue, it can also be shades of green, yellow, white or red. Fluorescence can occur at different intensities. Gemological laboratories such as the GIA rate diamonds for fluorescence on a scale from “None” to “Very

Carat

There are four C’s that are used to describe a diamond: cut, color, clarity, and of course, carat. The carat is the standard unit of measurement used to indicate the weight of diamonds and precious gemstones. Since 1913, carat weight has been gauged against the metric system, with one carat equaling 0.2 grams or 0.007 ounces. Carat weight



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.



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