The 4 C’s: Cut

Diamonds come in all shapes and sizes. But how are you supposed to know which one to choose? Check out our guide to learn more about the types of diamond cuts to choose from for your engagement ring or custom jewelry.

Cut is a grade on how well light interacts with the facets of the diamond due to the quality of its depth, symmetry, and proportions. After decades of studying diamonds, grading how the light enters a stone is more of a science. Cutting a stone, however, is definitely an art.

How is a Diamond Cut Graded?

Per GIA, the diamond industry’s grading standard, there is only one cut of diamond that is eligible for a diamond cut rating – the ever-classic round cut diamond. When it comes to grading the quality of a cut – it’s all about the math. A diamond’s cut grade represents how well a diamond reflects light.

Primary Grading Features:

  • Table Size
  • Star Length
  • Girdle Thickness
  • Crown Height
  • Crown Angle
  • Pavilion Angle
  • Total Depth
  • Pavilion Depth
  • Lower Girdle/Half Fact Length
  • Culet

5 Cut Grades

  • Poor: Typically has a poor weight ratio and a thick girdle.
  • Fair: A shallow crown and shallow pavilion angle can lead to a diamond being graded fair. These diamonds do not have enough contract of light and dark areas.
  • Good: A shallow pavilion angle limits this stone’s scintillation.
  • Very Good: Some darkness within the stone, which is typically caused by a combination of proportions.
  • Excellent: This diamond has an even pattern of dark and bright areas within the diamond to really deliver an outstanding sparkle.

Diamond Educational Series

Click the below areas to learn more


Diamonds come in all shapes and sizes. But how are you supposed to know which one to choose?


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A stone’s carat is determined by weighing the stone and calculating the carat from there.

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