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What is
Diamond Cut?

A quality cut grade allows a diamond to express its natural sparkle and scintillation.

Cut refers to the quality of a diamond's proportions and symmetry. These angles allow the diamond to capture light and reflect it, producing sparkle. If a diamond's pavilion is too deep, for example, the center will be noticeably dark.

If you want a truly brilliant diamond, consider those with cut grades of Very Good or Ideal. The Ritani Reserve collection is comprised of the top 1% of diamonds worldwide.

Learn more about how cut affects a diamond’s sparkle.
Ideal Cut
Tremendous sparkle. Excellent polish and symmetry. See all ideal cut diamonds
*Ritani does not carry poor cut diamonds.

The History of
diamond cut

Before the mid 20th century, there were no standardized criteria for diamond cut grading. The GIA developed a grading system based on seven components that affect a diamond’s brilliance. These factors are brightness, fire, scintillation, weight ratio, durability, polish and symmetry. Therefore, when a cutter is working with diamond rough, these are the elements they are hoping to maximize, thus making the diamond more rare and valuable. An incredible level of craftsmanship is required to cut a diamond that exhibits stunning sparkle.

Average diamond
cut grades

Ritani customers buy similar quantities of Ideal and Very Good cut diamonds. The proportion of diamonds with Good cut grades sold is significantly smaller. These diamonds, while exhibiting a fair amount of sparkle, are not nearly as brilliant as those with higher cut grades. Typically, Ritani customers value sparkle over carat weight and are not willing to compromise on a lower cut grade.

Cut Grades:
Reserve Ideal, Ideal,
Very Good, Good

Cut Grade:


Smaller diamond

More sparkle

Perfect polish

Visibly larger diamond

Slightly less sparkle

Very good polish

How cut affects
different shapes

For square and step-cut diamonds, such as princess, asscher, radiant and emerald shapes, a high quality cut grade – particularly with Excellent symmetry – is important. This will ensure a stunning sparkle is exhibited across the surface of the stone, and an even distribution of carat weight.

The most popular diamond shape, round, has an optimal depth percentage range of 58-62%. Ideal cut diamonds all measure between 58-60%, producing the most brilliant sparkle. As round diamonds are renowned for their sparkle, Ideal and Very Good diamonds are highly recommended.

Choosing your
cut grade

Cut is widely considered to be the most important of the 4Cs, having the greatest impact on a diamond’s appearance and quality. Because of this, we highly recommend you invest in a quality cut grade and consider carat, clarity and color secondary. That is not to say these are unimportant, or that you should feel a need to compromise. However, sacrificing sparkle for a larger diamond, or one that’s color can only be distinguished under magnification is not advised.

For diamonds other than round, also consider the length to width ratio of your diamond. While this does not necessarily impact its value, you are likely to have a preference on the diamond’s shape. Depending on the ratio, this can greatly affect the appearance of a diamond. You can use the advanced search options in Ritani’s diamond inventory to narrow your preferences.

Written by Paul Meiterman, Gemologist at Ritani

Paul Meiterman G.G., A.J.P., C.G. (Graduate Gemologist, Accredited Jewelry Professional, Certified Gemologist American Gem Society) is the Chief Gemologist at Ritani. With over 15 years of experience, he worked in the GIA laboratory as Quality Assurance Gemologist and now works in our factory alongside the top cutters, balancing out size, clarity and proportions for maximum beauty and value, making sure to bring out the best in every diamond.

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