All You Need To Know About Diamond Cut Chart

Do you want to know how a diamond Cut is measured? What makes a diamond gets a good cut while another gets a v.good? Basically it’s the Diamond Cut Chart.

Diamonds are one of the most beautiful gemstones you can find anywhere around the world. They are charming and adorable little cuties that make the eyes glitter and melt the hearts.

What makes a diamond sparkle more than another? Many reasons, but as we’ve said before: The most important characteristic in a diamond is the Cut! And diamond cut chart is what will let you know how to determine a good cut from a poor one.


And by the way, it’s a fact that no two diamond stones have the same characteristics, they might look the same under a lay man’s vision, but to gem professionals, it has been stated as a fact, that no two diamond stones are alike.

Purchasing a diamond is all amazing and exquisite, but it is not enough. You need to be equipped with enough information about the gemstone you are spending your hard earned cash on.

The more information you have about diamonds, and particularly: Diamond Cut, the better your shot at selecting the best gemstone for yourself.

The Four Cs Of Diamonds

The 4Cs are the factors through which the quality of a diamond can be scored and evaluated. These Cs are the criteria with which folks select the ‘better’ diamond out of the numerous options they have.

An analysis of these four Cs will help shed more light on how to select the best piece, we’ve covered them a lot in our website so we won’t go over that again here, but make sure you check them in the main menu on our website.

What Makes a Diamond Cut Grade?

What determines the quality of the diamond Cut? In other words, what makes an artisan professional in creating a perfect cut from another mid-pro artisan?

Diamond Cut Light ReflectionWe’ve said a before that Cut is the most influencing factor in light reflection through a diamond, as you see in the image here, when a diamond is cut to ideal proportions, light gets reflected very well, on the contrary, a poor cut results in light going through the diamond and exit from the other sides.

That’s why we always insist on investing the most on an ideal or very good cut, more that any other diamond characteristic.

The quality of the cut of a diamond is determined by the following three types of light reflection. When a diamond is exposed to light, it reflects in the following ways:

  • Brilliance

When light penetrates the crown of a diamond, instead of a rainbow of colors, a white light/ bright light flashes the eyes.

Some very good / ideal cut diamonds reflect light as white, like the one you see in the last image here, the lights gets into the diamond white, and leaves white, on the other side, and due to a less professional cut, the light reflects as rainbow, something like this image:

Diamond Rainbow reflection

  • Fire

This is a myriad of color that reflects when light penetrates the crown of the diamond. The light bounces around in the diamond and flashes the eyes in a myriad of colors.

Do you see the rainbow that reflects back from a diamond? This is what Dispersion or Fire represents! It’s the rainbow of colors that reflects back to your eye when you look at a diamond. The Light; like the first left diamond in the last image, enters through the top, and it breaks down into a rainbow of spectral colors, then it’s reflected back and forth in the interior of the gem by bouncing off the mirror-like facets. So when it leaves the diamond (through the crown), it doesn’t get mixed with the entering light, rather, it stays like a separated line till it reaches the eye, in flashes of colors.

  • Scintillation

Do you notice when you look at a moving diamond how light reflects through that? This is exactly what describes a scintillation, it’s the play of light that you see when you move the diamond against different light angles, and it’s demonstrated by sparkling on the diamond’s surface.


As you see in this image, when such a diamond is moved around the light, you can see different angles of reflecting color, a very good diamond cut will retain a good reflecting light when this happens.

Diamonds Shape Chart

Although the Cut of a diamond has little to do with the shape of the diamond, but much more to do with how the diamond reflects light, polishing, and symmetry, it is important to brush through the different shapes of diamonds.

Diamonds come in many shapes, around 10 of them are more popular than others, with the round shape being the most popular one, let’s take a look at each diamond shape, and possibly see real diamonds for each shape that are available to get.

Diamonds Shapes:


This is the most common diamond shape in the world. More than 80% of diamonds out there are made in the round brilliant shape, which includes a crown, the girdle, and the base.

Shop for popular Round shape diamonds


This is a diamond shaped like a pear, it has an even shape, a cleft on the crown, and a well proportioned girdle.

Shop for popular Heart shaped diamonds.


This shape is a hybrid of the marquise and oval shape. And it is mostly used in making earrings and pendants, due to its teardrop shape.

Shop for popular Pear shaped diamonds.


The marquise shaped diamond is one with two long pointed ends. It is a diamond shaped with two pointed ends and a not too broad middle.

Shop for popular Marquise shaped diamonds.


These are rectangular/ square shaped diamonds, which has many facets. Although this cut is new, it is gradually becoming one of the best selling diamonds in the market.

Shop for popular Princess cut diamonds.


The emerald shape has broad and flat surfaces, and cut corners like a square.

Shop for popular Emerald shaped diamonds.

It’s worth to mention that there are more other less-known shapes in diamonds industry, like Trillion cut, Asscher and others, but we just mentioned the most famous shapes, for the full list, check here.

What is Diamond Cut Chart? How Diamonds Are Graded?

The grading of the diamond according to cut, varies from Poor, Fair, Good, to Very Good,, Ideal, Super Ideal, and, according to the polishing and symmetry of the diamond, here we go over each one of them briefly:


The probability of the existence of these types of diamond is uncertain. But these are diamonds that don’t reflect any light, all reputed online diamond stores like JamesAllen or Blue Nile do NOT sell poor cut diamonds.

Read: JamesAllen Vs. Blue Nile Detailed Review & Unbiased Comparison


Not like they are ‘bad diamonds’, but they are not well-cut diamonds, and this affects their quality, they reflect as little light as possible, but that doesn’t mean they are not good (technically they are, because “good” is a higher grade 🙂 ).

It’s very unlikely that you will find a fair cut on the known online stores, so be careful if you’re buying from a local merchant, and make sure to see the GIA certificate for the diamond.

Blue Nile Ring


These diamonds are partially well-cut, based on the quality of sparkle that they give. They are cut in a way that they don’t lose their beauty or quality, they don’t reflect all the light that penetrates through them, but they are still worth a fortune.

You can easily find good cut diamonds on all online merchants, but for us, it’s not the best grade to get, always make sure to get the next grade “V. Good” and then decide other diamond characteristics.

Read: Diamond 4Cs and Order of Importance


These diamonds exhibit a higher cut and quality than the Good grade. They reflect a higher percentage of light; hence they sparkle more than the Good Grade, as a result of this, their worth and value are increased in the market.

They are seen as the best budget-friendly grade, and this grade is the recommended for people with budget, invest to get this grade more than any other factor.

Diamond Cut Light Reflection JPEG


These diamonds have a combined force of brilliance and fire; they sparkle and shine effortlessly, and also reflect almost all light that penetrates through the crown.

These diamonds are excellent cut and are worth a lot, around 3% of global diamonds make it to this grade.


A combination of Scintillation, Fire, and Brilliance, these diamonds are the pride of every cutter and jeweler. They sparkle all round with the slightest penetration of light.

They are superbly cut and ranks the highest in the diamond grading, different online vendors refer to such grade in their own trademarked terms, so for example JamesAllen offers this grade as TrueHearts™, while Blue Nile names them Astor By Blue Nile, feel free to read both articles to have a better idea about these collections.

With these types of diamonds, light reflection is as impossible as anything, and that’s why we listed them at the end and not before good. Just ignore them, and don’t ever invest a penny in a poor cut diamond.


The four Cs are significant determinants in the selection and purchasing of the quality diamonds. This is why it is essential to know them, to avoid buying a low-class diamond for a huge sum of money.

And since the Cut grade is the most important, it’s a must to know more about it and how it affects light reflection (and pricing), it also helps to select the best diamonds based on sparkles, light reflection, beauty, and brilliance.

Make sure you ALWAYS don’t get a diamond lower than V.Good cut unless you’re on a very strict budget, v.good dimaond cut will reflect most of the light and makes your diamond shine!

Make sure you also check our Diamonds FAQs page, where you can get more details on diamonds terminology and some of the most questions we always get from our readers.

If you have any questions, please feel free to contact us directly and we will respond within 48 hours max.

Find the One James Allen


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