Diamond-Cut: Your Ultimate Guide


Posted on January 16 2021

Diamond-Cut: Your Ultimate Guide

Diamond-Cut: An Ultimate Guide


If you're a diamond lover or looking to purchase a diamonds , you must have questioned yourself out of interest and curiosity, "What is a diamond cut?" Don't get confused with the shape of a diamond, such as a circular-cut or a pear-cut diamond (the structure of a stone), a diamond cut is an authorized grade detailing how correctly and nicely a diamond has been cut.


Out of all four Cs, including Carat, Colour, and Clarity of the Diamond, the cutting of the centre crystal on the wedding ring is perhaps the most noticeable and, thus, is expected to play a crucial role in your selection. As well as forming the structure of the gemstone, the diamond cut also brings an alluring sparkle that we are all so dazzled by. 

So without wasting any more time, we're going to look more closely at what the diamond cut is, the factors that affect it and how you can pick a beautiful diamond with an ideal cut.


Diamond-Cut: History

Born deep within the tubes of mineral-rich volcanic rock formations, diamonds emerge to the ground from these prime deposits by volcanic magma, which brings the diamond-bearing rock, often called kimberlite, to the surface. 

India is the birthplace of some of the world's most famous ancient diamonds and diamond folklore, but the modern era of diamonds and diamond cuts started in South Africa after being discovered in Kimberly in 1866.

Diamond-Cut Proportions

The diamond-cut refers to the proportions of a diamond, such as the facets and cuts (table, width and depth of the diamond) created out of a raw diamond to give it the desired form. However, what's incredibly significant is how these cuts and facets make the reflection and refraction of light, basically light that reflects off or light that moves through the stone, and how it sparkles in your eye. 

The discrepancy between how much light flows through the diamond and how much light reflects from the diamond surface into your eye helps produce a diamond trademark of "fire" or "sparkle". An ideal cut diamond is made from the combination of brightness and fire!


What is a Diamond-Cut Grade?

The quality of a diamond cut is the most significant element for the elegance of a diamond and the complexities involved, at least for the ones with least experience in this field. So, it's beneficial to understand more about how diamond cuts impact attractiveness and cost.

As listed in the official diamond grading 4 C's, the cut grade shows the cut's quality and the proportions of the diamond. Cut grading is necessary because it details how far the light will pass through the stone, making it appear brighter. For bright round diamonds, the cut grades range in the following order:


  • Excellent 
  • Very good
  • Good
  • Fair
  • Poor


Nowadays, most of the cutting is done through laser beams so most diamonds should lie in the Very Good to Excellent range. An excellently cut diamond sparkles brightly whereas a poor cut diamond appears dull and dead. The most favourable grades of cut are excellent and very good.  

The only possible explanation of diamonds having a less than excellent cut is subject to the diamond cutter trying to save weight. Diamond cutting is normally a balance between saving weight and preserving decent brightness, style and symmetry.


Bear in mind that cut grades refer only to round dazzling diamonds, whereas trendy cut diamonds, such as emeralds and hearts, do not have authorized GIA cut grades.


The fact is that 55% of all round shaped diamonds have an excellent cut grade from the GIA. Approximately 25-30% of these "excellent" diamonds are not approved due to bad specs such as depth and angles.    

That's why it's extremely important to have a proper look at the diamond cut grade on the GIA document, and also take a close look at the precious stone yourself or consult an expert as you don't want to end up paying for an excellent precious Jewel that's just average.

There are several factors affecting the grade of a diamond cut and also directly affect the cost of the diamond-cut, which include:

  • Proportion: refers to the link between the size, shape and angle of every facet. The proportion can be expressed as a percentage.
  • Symmetry: refers to the alignment of the Diamond facets, such as the table, crown, girdle and culet. Symmetry is rated on a scale ranging from excellent to poor.
  • Polish: refers to the level of smoothness of each facet. Polishing and cutting the diamond can introduce microscopic faults which may meddle the light from travelling through the diamond. Polish is ranked on the scale ranging from excellent to poor.
  • Brightness: refers to the internal and external white light reflected from a diamond.
  • Fire: refers to the dispersion of white light in all the shades of the rainbow.
  • Scintillation: refers to the sum of sparkle created by the diamond and the variation of light and dark areas induced by the stone's reflections.


How to choose an Ideal Cut Diamond


When a stone is carved, each attempt is taken to ensure that the dimensions are either perfect, outstanding, or very good. 


  • If the diamond is cut too short in height, the light will be lost as it will pass straight through. 
  • If the diamond is cut so deep, the light will be lost on its edges. 
  • The perfect diamond-cut causes the light to penetrate the diamond and reflect through its inner surface and bounce straight out, giving the viewer a shimmering light effect. When the diamond passes in and out of light sources, the different lighting paths seem to dance off its surface in a vivid series.


Many diamonds are cut to guarantee that their proportions are ideal for the stone to shine brightly in the light and give you that premium feel. The diamond is more attractive when it's bright and shiny. If care and attention are paid to its symmetry and the consistency of its polished surfaces, this will add even greater brightness and sparkle to its observer.


How is the price affected by the cut grading?

Diamond is that precious stone that everyone dreams of having, but the price is always of great concern. The diamond-cut price is based on the accuracy and quality of the cut—most importantly, its dimensions and symmetry. 

E.g., a diamond is all about the perfect cut you can find. Depth, table and all other proportions are as correct as they can be because of all these reasons you're paying a premium price for the stone, even compared to the standard excellent cut diamond.

If the facets, the glossy flat surfaces of a diamond, are proportional, they considerably refract and reflect light to the eye. Diamonds that are not as perfectly cut have non refracting and non-reflecting facets and pavilions.

The quantity of light reflecting and brightness that can be seen in an extraordinarily cut diamond is worth the cost of an extra diamond cut. Excluding brilliance and fire, the precious stone is much less than radiant, and this is the point where the table size and carat weight don't matter anymore.   

The price of a diamond-cut also depends on the carat weight of the diamond. A larger carat diamond clearly demands a higher price even with a marginally lower cut grade. In other words, while a diamond with a lower cut grade will fall slightly in cost, a greater carat size will make up more than that deficit. 

That being said, if the cut is so bad that the diamond looks clumsy, its worth will be limited. If you buy a stone with a lower than Excellent cut score, you might have purchased a dense stone that hides weight but does not look bigger than the same-sized or smaller stones. Besides that, a poorly cut diamond may also have less brilliance and fire than a similar correctly cut stone.

In simple words, the cut of a diamond is the attribute that most greatly influences its appearance. That's why the higher diamond-cut rates are worth the expense, and it's better to focus and spend more on the Cut than Color or Transparency.

If you're shopping on a budget and can't exceed the limit, we suggest that you forgo a GIA grade in Color and Clarity to ensure that you choose the ideal cut diamond. There are many queries that people have regarding the diamond-cut, so let's answer some frequently asked questions that might also help you make a sound decision.


What happens if the diamond-cut is very deep?

When the diamond is sliced too deep, the light enters through a sharper angle into the pavilion, allowing it to automatically reflect the next pavilion. Thus light is compelled to escape and slip into the bottom of the diamond. 

As this occurs, the illumination gets dull, and the diamond becomes less bright and sparkling. The Diamond cut that is too deep often appears to be smaller than the perfect cut.

What happens if the Diamond Cut becomes too shallow?

If the Diamond Cut is too shallow, the light will reach the pavilion at a low angle. The light beam passes through the diamond and exits via the edges, rather than just reflecting through the table and your eyes.

Although shallow-cut diamonds might appear big based on the table's size, the loss of light at the bottom greatly decreases the brilliance, shimmer and fire of the diamond.

How does diamond shape differ from the diamond-cut?

Both terms, Diamond Cut and Diamond Shape have different definitions. Diamond Shape defines the form or shape of a diamond. E.g., Pear Shaped and heart-shaped refer to the appearance of the diamond.

The cut applies to the facets, symmetry, proportions and reflective properties of the diamond. For example, the Heart Shaped Diamond may be cut shallow or deep, dull or dazzling. The shape of the heart persists, while the cut can vary greatly. The sharper the cut, the higher the brilliance and fire of the diamond.

What's the perfect cut for the diamond?

In very simple terms, a perfectly cut diamond significantly increases the light that reaches any pavilion. Instead of exiting from other Diamond areas, the light is reflected through the crown and the table.

When it comes to deciding the highest possible rating, GIA uses the expression "excellent" whereas AGS (the cut grade inventory) mentions the term "ideal." These cuts are well sculpted with maximum facet angles, allowing the fire and brilliance to flow across the table for all to see.

For such justifications, excellent cuts are more desirable and luminous. When you are buying on a budget, we always recommend picking a smaller, excellently cut diamond instead of a larger poorly-cut carat. If you're still uncertain of the perfect diamond cut, speak to a professional to get you through.

Top 3 most popular diamond-cut designs

You will always get a variety to choose from when it comes to diamond cuts, each of which can give your ring a special look to your requirements.

Brilliant Round Cut

Round dazzling diamonds are by far the most common bride-to-be cut, responsible for more than three-quarters of all engagement ring transactions. With a longstanding history covering many decades, this cut was created in 1919 by Marcel Tolkowsky and typically has 58 facets.

With its beautiful light-reflecting quality and eye-pleasing symmetry, it's an iconic diamond cut that's never going to date. If you want a more unusual style, the round brilliant offers itself well to several different contexts and looks and is especially spectacular surrounded by smaller stones to sparkle that vintage look.


The fact that an emerald-shaped diamond is the personification of glitz and glamour can be inferred from a long list of celebrities flaunting their engagement rings with an emerald-cut centre stone. The Hollywood icons Grace Kelly and Elizabeth Taylor both wore emerald-cut engagement rings for which their trendy look was celebrated for so long and became a fashion statement. This is one of the oldest diamond cuts that started in the 1500s.


The label of this alluring diamond shape is enough to make every bride feel like they've just walked out of a fairy tale. The princess-cut is one of the latest diamond shapes in the world and was first made in 1980. This princess-cut is the square version of the round-cut, which has a pyramidal shape with 58 facets. 


Summing it up, since cutting is so crucial to a diamond's elegance, it is necessary to closely see a diamond perform before purchasing it. Although certificates are perfect for sorting diamonds with bad performance, they can't tell you the contrast between an excellent cut with average performance and a stunning one.

When it comes to finding the right diamond for you, we prefer the diamond-cut quality above everything else. We suggest picking an excellent cut grade for GIA Certified Diamonds and choose the perfect cut for AGS Certified Diamonds. 

Don't forget to ensure that the diamond appeals to you and your unique taste and expectations. Once you're sorted with this, you're going to have the best diamond with you which you can flaunt on your big day or gift your loved ones to cherish the love and memories forever!





















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