The 4 C’s: Cut
Diamond Cut and Shape
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.
Join us in an educational series about how diamonds are cut and graded below.
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
Grading Facts

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
What is the Difference between Cut and Shape?
Though they are often used interchangeably, Cut is not the same as shape. Shape refers to the outline, or silhouette of a diamond. Cut refers to how the facets in a diamond are crafted. When a diamond is being graded, the cut is what is taken into consideration.
What are the Different Cuts?
There are 10 official diamond cuts to suit your individual taste. Find out what makes each one unique.
Diamond Educational Series
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Cut
Diamonds come in all shapes and sizes. But how are you supposed to know which one to choose?
Color
Protect your investment with a full appraisal report ready for your insurance provider.
Clarity
Clarity is an important factor in determining a stone’s value. In this article you will learn more about diamond.
Carat
Carat is the unit of measurement for the weight of diamonds, gemstones and pearls. A stone’s carat is determined by weighing the stone and calculating the carat from there.
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