Diamond Cut definition
"Cut" is used in two different ways in Diamond dictionary. First, it's used to describe the shape of a diamond: emerald cut, heart cut, oval cut... Second, "diamond cut" is used is to describe the reflective qualities of a diamond to determine how well the diamond was cut.
This second usage (the reflective qualities) is the one that is graded and gets a score on diamond certificates.
Diamond cut is the most important of the 4 Cs. A good cut gives a diamond its brilliance, which is that brightness that seems to come from the very heart of a diamond. The angles and finish of any diamond are what determine its ability to handle light, which leads to brilliance.
There are 4 grades of diamond cut.
1. Ideal Cut / Exellent
This cut is intended to maximize brilliance. Ideal quality diamonds are truly for the person who enjoys knowing that he has one of the finest things that money can buy. This category applies only to round diamonds.
2. Very Good Cut
These diamonds reflect most of the light that enters them, creating a good deal of brilliance. With these diamonds, the cutters have chosen to stray slightly from the preferred diamond proportions in order to create a larger diamond.
3. Good Cut
Diamonds that reflect much of the light that enters them. Their proportions fall outside of the preferred range because the cutter has chosen to create the largest possible diamond from the original rough crystal, rather than cutting extra weight off to create a smaller Excellent quality diamond. Diamonds in this range offer an excellent cost-savings to customers who want to stay in a budget without sacrificing quality or beauty.
4. Fair & Poor
A diamond graded as fair or poor reflects only a small proportion of the light that enters it. Typically these diamonds have been cut to maximize the carat weight over most other considerations.
How Cut Affects Different Shapes
The round diamond is by far the most popular shape, but Blue Nile carries nine others that are also affected by a high quality cut grade. However, all fancy shapes are an excellent value, so you can often get a larger sized diamond while staying within your budget.
For noticeable sparkle, we highly recommend our Blue Nile Signature cut, which is available in round, princess, emerald, Asscher, and cushion shapes.
Diamond Cut is the most important characteristic in the Diamond Grade - the 4Cs. Following are the list of other diamond characteristics in the 4Cs
Diamond Clarity is the visibility and number and size of inclusions Read more →
Colorless diamonds are the most desirable since they allow the most refraction of light. Read more →