Round Cut Diamond Buying Guide

The round cut diamond is as exquisite as it is timeless. Consistently the most popular cut (by a large margin) every decade for as long as diamond rings have been a thing, the round diamond is the most brilliant cut due to its perfectly symmetrical nature.

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    What to Look for

    Be sure your round diamond is GIA or AGS certified. A GIA excellent cut (or AGS 0)will be full of fire and brilliance

    Since round diamonds refract light better than any shape, you can drop down to I or even J color.

    As long as the diamond is eye-clean, you get great value with an SI1 or SI2 clarity diamond.

    What to Avoid

    Avoid 'special' branded cuts. A standard round excellent cut will be as brilliant without paying for the marketing

    With round diamonds, depth percentage is very important. Aim for 62.5% or lower and never go higher than 62.9%

    Don't depend on the clarity grades and focus on how the diamond looks in images/video.

    WHAT IS A ROUND CUT DIAMOND?

    As the most popular Diamond Shape, the Round Cut Diamond represents over two thirds of all diamonds sold.

    The Round Brilliant Cut boasts 58 facets (including the culet) and offers exceptional white light reflection, also known as brilliance. With a classic, timeless appearance, Round Brilliant Cuts are often used in engagement rings, necklaces and other fine jewelry pieces

    In 1919, Marcel Tolkowsky created a surge of interest in the Round Cut Diamond by publishing his work, “Diamond Design: A Study of the Reflection and Refraction of Light in Diamond” which highlighted the ideal cut aspects of a Round Brilliant. Since Tolkowsky’s influence, the Round Cut has remained the most common diamond cut.

    During the Victorian, Edwardian and Art Deco eras, the Old European cut was a popular diamond choice. As knowledge and technology advanced over time, diamond cutting techniques became more refined. Cut design progressed toward larger tables, smaller culets and longer, leaner facets. While Old Europeans were cut primarily for color, the Round Brilliant is cut for brilliance.

    Key Features of a Round Cut Diamond

    Here are some of the most noticeable features of Round Cut diamonds, including the proportions of an excellent cut Round Diamond.

    • 58 facets
    • Round, symmetrical shape (length-width ratio of 1-1.01)
    • Table % of 55-59
    • Depth % of 60.1-62.6
    • Thin to slightly thick girdle
    • No culet

    WHY ARE ROUND DIAMOND ENGAGEMENT RINGS SO POPULAR?

    Round cut diamonds are the most popular diamond shape. In fact, they make up approximately 75% of all diamonds sold, and about 60% of all.Here are the main reasons round cut diamonds are highly sought after for engagement rings:

    Beauty

    They’re cut with 58 facets that all reflect light back to your eyes. For over 100 years, diamond cutters have been perfecting the process for cutting round diamonds. The result: gorgeous gemstones with a classic appearance.

    Brilliance

    Brilliance is what makes a diamond sparkle. It’s the amount of white light that reflects off of the diamond’s table to your eyes. The ideal cut aspects of a round diamond provide more brilliance than any other shape.

    Fire

     A diamond’s fire refers to the amount of colored light that is dispersed by the diamond. This colored reflection gives a diamond character and beauty. When a round diamond has an exceptional cut, it showcases a tremendous amount of fire.

    Versatility

    Because the round brilliant boasts a classic design, it complements many styles, from modern round cut diamond rings to vintage engagement rings. Round cut stones are often chosen for side stones as well, like in this three-stone ring from James Allen, or this pavé setting from Blue Nile.

    Timeless Appearance

    Round-shaped diamonds have been in style for centuries. With their beautiful facets and elegance, a round cut ring is a classic choice that will be cherished and handed down for generations.

    Beauty

     A diamond’s fire refers to the amount of colored light that is dispersed by the diamond. This colored reflection gives a diamond character and beauty. When a round diamond has an exceptional cut, it showcases a tremendous amount of fire.