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Diamond cut is part of the 4Cs and influences the reflection, brilliance and sparkle of your diamond – and therefore plays a big role in determining the price of diamonds. The cut grade takes a few different elements into consideration such as proportions, polish, shape and symmetry of the diamond. Combined, these factors influence the way light is reflected when it enters the diamond and exits from the table. The better the cut, the more sparkle and brilliance the diamond has making it all the more stunning.

With a good cut, the light that enters the diamond through the table travels to the pavilion where it is reflected back out through the table. The angle at which the light is reflected determines the brightness of that iconic diamond sparkle. Therefore, diamond cut is a critical part of what makes your diamond come to life when you’re wearing it as jewelry.

Grading the diamond cut

While there are some differences between grading systems as to how a cut grade is described, there are general rules accepted as the international standards for defining diamond cut grades.


This is the very best diamond cut grade a diamond can have. The brilliance is simply stunning as the light is perfectly reflected through its ideal proportions and symmetry. These diamonds are of maximum quality and highly valued.


While still absolutely stunning, they are not exactly perfect in terms of symmetry and proportions. However, wearing a diamond with Excellent Cut will still have that sparkle we all expect from a brilliant diamond.


Diamonds of this cut grade are a great way to balance size and quality as the brilliance is still stunning, yet slightly below the Ideal and Excellent cut grades. The diamonds provide good value for buyers looking for a slightly larger diamond at the same price of a smaller diamond with a better cut grade.


When it comes to Good Cut, the diamond’s proportions and symmetry is slightly off from what is considered the ideal. This is usually a result from the diamond cutter’s choice to maximize size when cutting a rough diamond into a polished diamond. That said, diamonds with this cut grade will still shine with brightness and sparkle.


These are typically diamonds where maximum carat weight was the most important criteria above the cut grade. Most diamond buyers prefer to have a better cut grade for a smaller diamond to make sure what they have a diamond that has enough brilliance.

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