Diamond Education: Cut
In order to select a diamond best suited for the wearer, it is essential to understand the basics of diamond quality. Commonly known as the “4Cs”s, cut, color, clarity, and carat are the universally recognized criteria used by jewelry professionals worldwide to describe the appearance and value of a stone.
While carat, clarity, and color are all crucial for deciding upon the perfect stone, ultimately the key to a diamond’s brilliance lies within the quality of its cut. This is because the cut is oftentimes the factor that determines how the stone captures and reflects light.
In this article, we will be discussing the basics and significance of the cut, and the role it plays in choosing the perfect diamond.
The Basics of Diamond Cut
In the language of diamonds, the “cut” can sometimes refer to the diamond’s shape. In the context of this article however , we will be focusing on the traditional definition of cut, which refers to how well it has been formed and faceted into its final shape.
A well executed cut involves the utmost cooperation from all facets of the diamond in ensuring an optimal amount of brilliance, scintillation, and fire. This includes having the facets organized in a way that maximizes the amount of light refracted and reflected to the wearer from out of the diamond’s table, or topmost face of the diamond.
Brilliance – Describes the quantity of white light reflected from the stationary diamond to the viewer. The higher the brilliance, the brighter the diamond. Poorly cut diamonds tend to appear duller with dark patches scattered within.
Scintillation – Refers to the trademark light and dark sparkles of light cast by the stone when in movement itself, or when viewed by a moving observer. Scintillation is a dynamic attribute.
Fire – A diamond’s fire refers to the spectrum of colors that result when white light enters it, and the stone disperses the light into its constituent wavelengths. In this regard, the diamond essentially acts as a prism.
When a diamond’s cut is subpar, it’s dimensions are poorly organized with regard to its ability to reflect and refract light back to the viewer. This results in an inefficient use of light. With a subpar cut, light enters the stone and bleeds out from the bottom and sides, leading to a less brilliant look that’s both dull and uninspiring.
The Quality of the Cut: The GIA Grading Scale
Created to evaluate the quality of a diamond’s cut, the Gemological Institute of America (GIA) has set up a grading system to help consumers make an informed decision when on the journey for purchasing a diamond.
The GIA’s cut grading system is tier based and is as follows:
Excellent – Diamonds with an Excellent cut possess the necessary facet arrangement and polish to make the most efficient use of light. This means that nearly all light gets reflected back at the wearer with very little wasted light leaking through the sides or bottom of the stone. This lead to a diamond with an exceptional level of brilliance, scintillation, and fire.
Very Good Cut – stones of this grade still reflect the majority of the light entered. What distinguishes the Very Good rating from the Excellent is that the proportions of the former exhibit more variability, resulting in less symmetry. Stones at this tier do have a minimal amount of light leakage, nonetheless they still reflect light with a high degree of brilliance, fire, and scintillation.
Good Cut – Diamonds of a Good cut exhibit generous sparkle and are quite desirable, fitting in as the more affordable versions of higher graded stones. Such diamonds are often regarded as great value based purchases, since stones of this tier still have excellent light play while being a fraction of the price of their more proportionate cousins.
Fair and Poor Cuts – Being the lowest of the scale, such diamonds lack the ability to reflect light efficiently. The majority of the light entering the diamond is not reflected back at the viewer, resulting in highly diminished brilliance, scintillation, and fire. As such, these are the lowest quality stones, evidently shown in their duller appearance.
Understanding What Makes the Cut of a Diamond
When selecting a diamond, in addition to the cut, one must also consider the elements that contribute to a diamond’s cut grade, namely the proportions, symmetry, and polish of a given stone.
Diamonds with excellent cuts have all three of these characteristics set in a way for optimal light performance.
Proportions
The proportions of a diamond refer to the relationship between the size, shape, and angle positioning of its physical components. These include:
- Table: The topmost facet that is seen when the diamond is viewed face up.
- Crown: The portion of diamond anatomy encompassing everything between table and girdle.
- Girdle: The widest part of the stone. In a round brilliant shape, it’s what makes up the diamond’s circumference.
- Pavilion: Referring to the portion below the girdle, the pavilion gives the round brilliant diamond its signature “V” shape from the side.
- Depth: Also referred to as the “height” of the stone, the depth is the distance from the diamond’s table to the tapered point of the stone, or culet.
For diamonds with excellent proportions, these different components are set up in relation to each other in a way that optimizes the reflection of light, leading to a stone with a higher amount of brilliance, fire, and scintillation.
Symmetry
The symmetry of a diamond is a measure of how precisely its facets were cut and aligned with one another. This includes consistency of the angles and that the configuration produces equal light return regardless of how the diamond is rotated.
Polish
A diamond’s polish describes the condition of the various surfaces on the stone. In other words, how smooth each facet is. In a well polished stone, light travels undistorted through it, which is one of the requirements for a brilliant shine. If the stone is tainted with any blemishes or abrasions, interference to the light’s path can result in a duller looking stone.
Conclusion
As we come to a close, it’s clear that a diamond’s cut is one of the most important factors to consider when purchasing a stone. All aspects of diamond cut ultimately add up to determine how brilliantly a diamond shines. Each diamond has its own personality thanks to the endless combinations of the 4Cs – cut, clarity, color, and carat – but in the end, the cut remains arguably the most important factor in determining the degree to which a diamond would sparkle.
With this in mind, it’s important to consider the diamond’s cut in light of other factors. The best stone fits in harmony with the other characteristics, and matches both your budget and what you’re looking for.
At TeLayne Designs, we understand how choosing a diamond can be, and our team stands by to help. We take pride in helping clients on their diamond journey, and take care of each aspect of the custom jewelry process from sourcing the diamond, to setting it.
With over 40 years of experience in the jewelry industry, we have connections with diamond dealers around the globe to help ensure that you get the best stone, at the best price.
We invite you to get in touch with our team today, and experience why we’ve been Dallas’ preferred custom jewelers for the past 40 years.