Monday, July 22, 2024

How Diamonds Are Cut — What Are The Different Types Of Cutting & How Are They Graded?



The most important part of a diamond’s manufacturing process is the rough cut which can be achieved using either a Dremel or water jet. The rough cut must be accurate because all the other steps will shape the surface to create a smooth edge. In order for this to happen, with proper polishing, the rough cuts must lie in perfect equilateral triangles that fit perfectly against each other and make up 60% of an octahedron. These shapes make it easier for equipment changes such as tables to more easily move around each step during production so they can continue on with their work efficiently. One can buy Loose Diamonds in Miami for all the cuts that are made into all diamonds, as well as what types of diamond shapes, such as round brilliant cut, princess cut and emerald cut, are usually best in terms of size and value.

What is a diamond cut?

A diamond cut is the way in which a diamond is shaped after it has been rough cut. Diamond cut grading is based on the proportions of a diamond. The three most important characteristics of an aspect are Brilliant Cut, Table Proportions and Polish with each having its own category in diamond grading process.

The proportion that is considered best for round brilliant diamonds with 58 facets is called Ideal Cut. The perfect proportions for round diamonds are Face-up Size (Diameter + Width), Index of Refraction and Crown Angle. In this type of cutting, often the girdle will appear to be too thin and a pleasant sensation will be felt when holding it in your hand because of this smoothness.

What are the different types of diamond cuts and how are they graded?

To achieve a round brilliant cut, the facets (the angles at which the diamond is cut) are evenly spaced around the perimeter of the stone. Antique diamonds can have more than one facet on each side and extremely high-quality diamonds can have three or even four sides with as many as 58 or 63 facets. The shape can also be slightly rounded at one corner to minimize chipping, again negligible to the consumer. The shape of a round brilliant is the most commonly sold by jewelry stores and is the most popular for engagement rings.

Most jewelers use the Ideal Cut grading system which was originally devised in 1961 by the Gemological Institute of America (GIA) and is based on three characteristics: Face-up size, Crown Angle and Table proportions.

The crown angles are important as well as other angles when looking at detailed information about a diamond. It is considered to have excellent quality if above 21 degrees, but there are too many exceptions to this rule to place it as a universally accepted fact. The table proportions indicate how much weight each side takes in relation to the width of each side.

There are also many other grading systems that are used around the world, including the European cut grading system and the Japanese cut grading system.

What is a Brilliant Cut diamond? – It is a diamond or gemstone with an irregular flat-faced shape. The flat back of a brilliant-cut gemstone allows more light to enter through the sides, which makes its cut more important than its depth when it comes to value. Brilliant cuts can be freeform (any shape) or have traditional shapes such as round, oval, heart, pear and marquise (which has one long side and one short side). The top of a brilliant cut can be pointed or girdled.

The 4 C’s of Diamonds

There are 4 C’s of diamonds. They are:

  1. Carat (Carats = 2x weight in grams)
  2. Clarity (Clarity = 0.25 – i.e AA and above)
  3. Color (Color = G-H or better)
  4. Cut (Cut = Flawless or Near Flawless, ½ & ¼ Round Brilliant, Brilliant Pointed and Marquise Cut Sizes).

This is a rough-cut diamond with the cut grading done to determine if it was cut within the looser proper of the stones and is therefore a loose stone while they will be graded as well.


Today, diamond cutting and polishing is an extremely complex and artful process. Although it was once only a blacksmith’s job, today diamond cutters and polishers have to be skilled at several crafts that all work together. From the cutting machines to the human hands of the cutters, a diamond must go through a long, arduous process with many pieces of modern technology to bring it from a piece of rough crystal all the way to the finished product that sits in its box in an elegant display case or on your loved one’s hand.

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