Saturday 25 May 2019
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Some Diamonds Are a Cut Above the Rest

Some Diamonds Are a Cut Above the Rest

The cut quality is the only value factor when evaluating a diamond that originates from human intervention. Gaining a basic understanding of a diamond’s cut is essential when making a purchasing decision.

Defining a Diamond’s Cut

Cut refers to the alignment, proportion, and the finish of the stone’s facets. A proper cut allows a diamond to release its full impact when it comes to fire and brilliance. Therefore, a well-cut diamond is considered to be of a higher quality than a stone whose cut quality is compromised for carat weight. In addition, the cut of a diamond also refers to its shape.

Diamond cuts include round, marquise, and princess cuts, to name a few. However, it is easier to understand cut if you limit the discussion to the diamond’s facet alignment, proportions, and finish. Well-cut diamonds yield less of a carat weight and are costlier to create. Therefore, diamond experts concur that the cut is the main indicator of a diamond’s features and value.

As a result, a diamond that is well cut reflects and refracts a high amount of illumination back to the eye. A poorly-cut stone, on the other hand, allows the light to leak from the bottom. This results in diminished fire and brilliance.

Engagement rings in Houston and elsewhere that seem to incessantly glisten are assessed by a number of factors. These factors are associated with light performance, proportion, and finish. With respect to light performance, the elements that are measured include brightness, dispersion or fire, contrast, and leakage.


Diamond Grading

With respect to proportion, the elements that are surveyed include girdle thickness, weight ratio or spread, cutlet size, tilt, and durability. Finish factors include polish and symmetry. This type of grading system assesses every component of a diamond in arriving at a grade for the cut.

The three aspects of a diamond’s overall beauty include brilliance, fire, and scintillation (also known as sparkle). These separate but related characteristics should be in balance when a diamond is cut properly.


Fire defines a stone’s ability to act as a prism, or break the whiteness of light into individual colours. As a result, a well-cut diamond will show sparks of green, red, yellow, and blue. These colours occur when light interacts with each of diamond’s facets and then is returned to the eye.

Brilliance and Sparkle

Brilliance is often defined as the total amount of illumination that is returned to the eye in the stone’s overall brightness. Scintillation or sparkle, on the other hand, is created by the blinking facets of a diamond as they respond to movement. In order to achieve the maximum amount of sparkle, a stone must be cut so that it creates a balance of positive contrast and brightness.

A Cut Above the Rest

Needless to say, the quality of a diamond’s cut is a complex interaction of facet angles, finishing elements, and proportions. Diamonds that exhibit top-quality cuts are known as “Ideal Diamonds” when graded under the guidelines of the American Gem Society Laboratories, or AGSL. Diamond cuts of this type are rated as “Excellent” by the Gemological Institute of America, or GIA. These designations distinguish those diamonds that are a cut above the rest.