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About Round-Cut Diamonds

The exceptional round brilliant diamond has been engineered to achieve optimum light return. When each of its 58 facets is cut with perfect precision, this abundance of light creates a balance of fire, brilliance, and scintillation. All of this translates to a striking, sparkling diamond.

Marcel Tolkowsky, a mathematician and engineer, is widely credited with creating the ‘ideal cut’ proportions for a round brilliant-cut diamond. His original design provided the foundations of a round-cut diamond, which has since been improved to further light return and better suit modern diamond cutting techniques.

For a closer look at the ins and outs of buying a diamond, take a look at our Complete Diamond Buying Guide.

GIA Certified Round Diamonds

Instead of delving deep into proportions and percentages, modern buyers can benefit from GIA diamond reports. Expert gemologists scrutinize each individual diamonds in a complex series of tests, before issuing them consumer-friendly cut grades.

The report outlines the necessary characteristics of your round diamond: clarity, color, cut, and carat weight. The specific proportions of the diamond can be found on the lab certificate report, along with the given grade; Excellent, Very Good, Good, Fair, and Poor.

All of our GIA round diamonds can be set in a piece of jewelry of your choosing.

Round Cut Diamond: Frequently Asked Questions

Need to know more? Here are some of our frequently asked questions from customers looking to buy round diamonds.

Choosing a carat weight is entirely personal. Generally, 1.00ct round diamonds are the most popular choice; however, anything from 0.50ct upwards can look beautiful in the right setting.

Round diamonds require a large majority of the rough to be lost during the cutting process. For this reason and their popularity, they are slightly more expensive than other diamond shapes.

The brilliant facets of a round brilliant-cut diamond make it a more forgiving cut when it comes to inclusions, particularly if they are positioned on the outer edges of the diamond. This is great for those working to a budget as you can save on a lower clarity grade.

The round brilliant-cut diamond is universally flattering, with an unrivaled sparkle. It is an extremely popular cut; however, personal taste should be the driving factor when you choose a diamond.