Enter the diamonds height/length and the width into the calculator to determine the diamond cut score.

Diamond Cut Score Formula

The following equation is used to calculate the Diamond Cut Score.

  • Where DCS is the diamond cut score, also known as the diamond length to width ratio.
  • L is the length or height of the diamond.
  • W is the width of the diamond

To calculate the diamond cut score, divide the height of the diamond by the width of the diamond.

What is a Diamond Cut Score?


Diamond cut scores, and their grading systems have become a common practice in the diamond industry.

The GIA (Gemological Institute of America) created the first complete system for diamond grading, which was updated in 1975 and is still used today. The GIA’s cut grade is based on whether or not the diamond exhibits “excellent symmetry,” as well as other more specific characteristics used to determine the overall quality of a diamond. Its essential score breaks down into the following:

Excellent-FA (Fairly Good): The highest grade for shape and symmetry. A “Fairly Good” diamond would only be one step away from an ideal cut.

Good-VG (Very Good): The next tier down from FA, VG diamonds are generally considered Ideal when it comes to shape, with only minimal flaws present.

Very Good-G (Good): The G grade represents diamonds that are beginning to show slight deficiencies when it comes to shape, but are still Very Good diamonds overall.

Good-F (Fair): Here we start to see diamonds that aren’t exactly Ideal when it comes to shape. However, they have enough redeeming qualities that they still fall under this category.

Fair-PQ (Poor Quality): This category is where we find diamonds with poor characteristics.