Cut is a reference to the proportions, symmetry, polish and shape of a diamond. It is the cut of a diamond that will influence the diamond's reflective character. This is the extent to which a diamond will reflect light from within itself, from one mirror-like facet to another, and then disperse it though the top of the stone, known as a diamonds "brilliance".

A diamond with well cut angles (symmetry) and a good finish will enhance the diamond's light and brilliance. In a well cut diamond, light enters through the table and travels to the pavilion where it is reflected from one side to the other before being reflected out of the diamond though the table. A well cut diamond will reflect all of the light back causing the stunning brilliance that makes diamonds so alluring.

In a poorly cut diamond, light enters through the table and travels to the pavilion and then "leaks out" of the facets at the sides or bottom of the diamond. A reduced amount of light is reflected out of the diamond through the table, with reduced brilliance.

Cut Descriptions
Due to the importance of cut, a range of cut grades between well cut and poorly cut diamonds has been developed. The AGSL (American Gem Society Laboratory), HRD (Antwerp Diamond High Council) and GIA (Gemological Institute of America) use different standards when grading a diamond’s cut, and at present only allocate a Cut Grade to round diamonds.

Despite the minor differences between the various grading systems the following different cut grade descriptions are broadly accepted by the diamond industry:

Ideal Cut
Ideal cut diamonds maximize the brilliance that is reflected out of the table of a diamond. This maximum brilliance is achieved through the exact calculation of the diamonds symmetry and proportions. When finished with the highest standards in polishing of the surface of the stone, these diamonds become the best available.

Excellent Cut
While generally also displaying maximum brilliance, excellent cut diamonds are not as exacting in terms of their symmetry and proportions.

Very Good Cut
In a very good cut most of the light that enters the diamond will be reflected back though the table, creating a high amount of brilliance. Craftsmen working on these diamonds would have made the decision to stray slightly from the proportions and symmetry of ideal cut and excellent cut diamonds, to create a larger diamond. For example a very good cut diamond may have a table size or girdle width that does not comply with ideal cut or excellent cut diamonds. However, in many instances, very good cut diamonds will possess symmetry and proportion characteristics that overlap with those of ideal cut and excellent cut diamonds. These diamonds provide a very good value purchase for buyers seeking a slightly larger diamond for the same price as ideal cut and excellent cut diamonds.

Good Cut
These diamonds will reflect much of the light that enters them back through the table. In such diamonds the craftsmen have significantly deviated from the proportions of ideal cut and excellent cut diamonds to create the largest possible diamond from the original rough crystal diamond. By way of an example these diamonds may have a crown angle or depth that is further deviated from the proportions acceptable in a very good cut. These diamonds may provide the option of a larger diamond then a very good cut diamond for the same price.

Fair and Poor cut
A fair or poor cut diamond will only reflect a small amount of the light that enters, back though the table. Most usually these diamonds have been cut where maximum carat weight was the most important criteria.

Please note that DiamondCelebrations.com does not stock fair or poorly cut diamonds.

What to consider when deciding on your diamond’s cut:
In deciding on one of the above cut grades you will compare the importance that you place on brilliance with the importance that you place on the other elements of a diamond such as size, clarity and colour.

We have made this easier for you on our Recommended Diamonds page, where you can enter your budget and select which criteria are most important to you. We will present you with the 30 top results according to your choices.