Diamond Cut


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Gemstone cut is one of the “four Cs” used to determine the overall quality, and therefore the cost, of a diamond. Most diamond certificates will include a rating of the diamond’s cut, and, all other things getting equal, a diamond with a much better cut grade will command a greater price.

While the other three criteria (clarity, color, and carat weight) are relatively straightforward and simple enough that they can be understood and evaluated by anyone, cut is a much more complex variable.

The methods for determining a diamond’s cut rating can vary depending on who is making the assessment, plus, to further complicate the matter from the buyer’s perspective, some certificates don’t describe in much detail what criteria they used to grade a diamond’s cut.

That being said, if you’re thinking of purchasing a diamond, it would be well worth the time it will take to understand what different cut marks mean, how they’re determined, and what influence they have on a diamond’s cost. This knowledge makes you better able to determine for yourself what a diamond’s price should be, distinguish a good deal from a poor one, and make the best possible investment decision when buying diamonds.

What is gemstone cut?

In simple terms, the cut grade of a diamond refers to the “light performance” of a diamond, meaning the degree to which the diamond retains plus reflects the light that enters it. A diamond with a good cut is going to be highly reflective and exhibit the best amount of sparkle. Conversely, diamonds that “leak” light through the bottom or side are usually cut too superficial or deep respectively, and they will therefore have a less favourable cut grade.

Since it’s widely acknowledged the aforementioned sparkle or brilliance is exactly what gives diamonds their unique beauty, it follows that cut is what sets apart the most stunning diamonds from simply ordinary ones.

It should be noted that will “cut” in this sense does not make reference to the intended shape of the gemstone.
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If you’ve ever browsed for expensive diamonds, you’ve probably come across terms like “Princess cut, ” “Asscher cut, inch “Emerald cut, ” and so on. These refer only to stylized diamond styles, and are not an indication of a cut rating.

What diamond cut grades are there?

At this point there still is not a standardized system for diamond cut grades. Each certifying authority utilizes its own system to rate the cut of a diamond, which can make items slightly confusing. Thankfully, however , the grades themselves are usually fairly self-explanatory, even if the methods used to determine all of them aren’t all that clear (more on that later).

Most certifiers make use of a five or six-point cut grading system. The typical system goes the following, from best to worst:

Ideal: A diamond with maximum brilliance.
Superior: Nearly equal to Ideal.
Very Good: A diamond with slight light leakage.
Good: A diamond with decent reflectiveness, usually one which has been reduce for size rather than brilliance.
Fair or Poor: Diamonds that reflect relatively little light.

Again, though, in some cases the terminology that is used may differ, the Gemological Institute of The united states, one of the major diamond rating professionals, for example , grades diamond cuts because Excellent, Very Good, Good, Fair, and Poor; so , diamond cuts ranked “Excellent” by the GIA will be roughly equivalent to those rated “Ideal” by other bodies. Additionally , some gemstone vendors have a special designation for his or her best cuts. For example , the online gemstone retailer Blue Nile has a “Blue Nile Signature Ideal” cut, the term which they use to refer to cuts within the top 1%.

How are diamond cut grades assigned?

This is how things start to get complicated. The methods utilized to quantitatively assess the quality of a reduce vary. The way the GIA determines what a diamond’s cut grade should be, for instance , differs in very specific ways from the way other certifiers like the AGS do it. In most cases, these businesses don’t divulge the exact details of the processes they use.

The shape of a gemstone also makes a difference with respect to how the cut grade is determined. Although there a few basic criteria that remain the same for any type of diamond, the exact strategies used to grade a round diamond’s cut are different from those utilized to grade a heart-shaped diamond’s cut. The remainder of this explanation will concentrate on round diamonds, as this is by far the most typical diamond shape.

One of the factors influencing the cut grade of a round diamond is the number of facets they have. Facets are the flat, defined areas on the surface of a diamond. The aspects on round diamonds are usually triangular. Currently, it’s thought that the ideal circular diamond should have 33 facets around the crown (the section of the gemstone that sits above the girdle, which itself is the widest stage of the diamond) and 25 on the pavilion (the lower, longer portion of the diamond).

When there are imperfections on the surface of the diamond, cutters may add extra facets in order to imprecise them. This results in a degradation in the overall quality of the reduce.

While the facet count is generally decided as a good way of judging the quality of a diamond cut, there are other factors on which gemologists frequently disagree. Some of the other factors used by some authorities to help determine cut grades include the height of the diamond’s crown, the level of the pavilion, the diameter of the table (the top of the crown), as well as the angles of the crown and pavilion.

The American Standard benchmark to get round diamonds calls for a crown height of 16. 2%, pavilion depth of 43. 1%, plus table diameter of 53% from the total girdle diameter. The Ideal Brilliant benchmark, however , calls for 19. 2% crown height, 40% pavilion depth, and 56. 5% table diameter. While these differences may be difficult for amateurs to discern, these are a good illustration of the difficulties related to creating a simple assessment of a diamond’s cut.

Although there are some disagreements regarding the exact proportions that constitute the ideal diamond cut, for prospective gemstone buyers, the most important thing to understand is that diamond certifications provided by organizations like the AGS and GIA are trustworthy plus meaningful. Reputable diamond vendors bottom the prices at which they buy and sell diamonds on the cut as well as the rest of the “four Cs. ” When you purchase a gemstone, you don’t have to worry about the perception of what makes a good diamond cut modifying so much that the value of your diamond will be significantly affected.

Which diamond cut grade represents the best worth?

Which sort of diamond is best for you largely depends on your budget. For customers who are willing to purchase them, vendors usually recommend diamonds with the highest possible cut grades. However , this may be because of some self-interest on their part.

Another three Cs have an impact on diamond prices as well, so it can be difficult in order to gauge the exact difference in price in between an Ideal or Excellent cut diamond and a Very Good cut. For casual buyers and budget-conscious investors as well, diamonds with a Very Good or Good cut grade can represent a great value. This is because, while they can be more affordable than otherwise equivalent Ideal or even Excellent cut diamonds, the noticeable difference in quality is minimum.

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