The cut of a diamond determines how it reflects light, which is responsible for its sparkle or brilliance. There is no single measurement of a diamond that defines its cut, but rather a collection of measurements and observations that determine the relationship between a diamond's light performance, dimensions and finish.

The width and depth can have an effect on how light travels within the diamond, and how it exits in the form of brilliance. A well-cut diamond (Ideal) is cut by a skilled professional to the best proportions possible.

When a diamond is well-cut, light will be reflected from each of its mirror-like facets and disperse through its top.
When a diamond is cut too Shallow, light is lost through the bottom causing the diamond to loose brilliance.
When a diamond is cut too Deep, light escapes out of the sides and causes the diamond to appear dark and lifeless.

Because a diamond with perfect color and clarity could nevertheless have poor brilliance if it is not well cut, many gemologists consider this to be the most important property to note when choosing a diamond. Diamonds can carry cut grades of Excellent, Ideal, Very Good, Good, or Fair.

Diamond Anatomy

To better understand a diamonds cut, it is important to be familiar with the anatomy of a well cut diamond. In general, a well cut round brilliant diamond will have 58 facets. These facets all have names which correspond to their location. In order to achieve an ideal cut diamond, the facets must be both symmetrical and well polished as well as the angles of the diamond must fall into a narrow range in order to achieve maximum brilliance. At Gause and Son Jewelers, all of our diamonds are hand selected for their superior cut and polish to make sure you are buying the finest diamonds available.

Polish and Symmetry
Polish and symmetry are two very important components of a diamonds beauty and will effect a diamonds cut. Polish simply describes how smooth the facets are. If a diamond is not polished well, there can be polish lines that may appear as streaks throughout the diamond and may create a blurred or dulling effect. If the symmetry is poor, the light entering and exiting a diamond can be misdirected and also affect the brilliance and sparkle of a diamond. Polish and symmetry grades are listed in diamond lab reports. Look for excellent (EX), very good (VG), or good (G) on a diamond grading report.

Polish, symmetry and the diamonds overall measurements are factored together to give an overall cut grade:

Please contact us if you have any questions or would like to make an appointment with one of our professionals.