Round Cut Diamonds - An In-Depth Guide to Purchasing a Round Diamond - Do Amore

Round Cut Diamonds

Round cut diamonds are the world’s most popular diamond shape. In fact, at the time of writing this article, more than 73% of diamonds for sale globally were round shapes (869,334 round cut diamonds out of 1,178,007 total diamonds)! That means that the other nine diamond shapes combined make up only 27% of the diamonds available for sale. Why are round cut diamonds so popular? Because a round diamond’s ability to optimize light reflection makes it brighter and more brilliant than all other diamond shapes.

Table, Depth & Other Specifications for Ideal Round Cut Diamonds

Round diamonds are the only diamond shape that the GIA grades for cut. How well a diamond is cut is the single most important factor when purchasing a round diamond. The GIA assigns round diamonds with the following cut grades: excellent, very good, good, fair, and poor. We personally only recommend purchasing round diamonds with an excellent cut rating, which is the highest cut grade the GIA assigns. Though some diamond search engines may be populated with the term “ideal cut”, remember that your GIA certificate will never define cut as “ideal”.

The table below serves as a general guideline for evaluating the cut of a round diamond. GIA takes these and other factors into consideration when assigning a cut grade. We have also populated our own “ideal cut” criteria in the table below to help you pick out the best of the best round cut diamonds.

round-cut

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Ideal Cut (Most Sparkle)

Excellent Cut

Very Good

Table %

A percentage measuring the width of the top facet of the diamond, divided by the overall width of the diamond

56 - 58

55 or 59

53-54 or 60-61

Depth %

A percentage measuring the height (depth) of the diamond divided by the overall width of the diamond.

60.1 - 62.8

58.7-60.0 or 62.9-63.2

57.5-58.6 or 63.3-63.9

Girdle

The outmost edge of the diamond where the top (crown) of the diamond intersects with the bottom (pavillion) of the diamond.

Thin to Slightly Thick

Thin to Slightly Thick

Thin to Thick

Culet

The small area at the very bottom of a diamond that looks like a point.

None

None

Very Small

Length to Width Ratio

The length of a diamond divided by its width. When comparing diamonds, those with larger ratios appear longer and skinnier.

1 - 1.01

1 - 1.01

1 - 1.02

Color Recommendations for Round Cut Diamonds

Evaluating color in round cut diamonds is subjective. Keep in mind that many customers may actually prefer the ever so slightly warmer colors of a G-H diamond over the cool colorlessness of a D-F diamond. In fact, most of the premium in price associated with round diamonds at the higher end of the color scale is driven by supply and demand; customers want the D-F color grades, and are willing to pay a premium to get them. In a world without diamond color grading, the price premium for higher grades would be much lower, as the actual differences in color are difficult to perceive. The color chart below provides a general guide for evaluating color in round diamonds.

round-cut

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Carat Weight

No Visible Color

Limited Color Okay

Prefer a Warmer Color

< 0.5

D - J

K - L

M +

0.75

D - I

J - K

L +

1

D - H

I - J

K +

1.5

D - G

H - I

J +

2.0 +

D - G

H - I

J +

Clarity Recommendations for Round Cut Diamonds

Like color, evaluating clarity in round diamonds is subjective. GIA provides excellent help with  their clarity grades. Still, it is important to understand that each customer will have a unique standard for clarity. Some may be perfectly comfortable with an inclusion as long as they cannot easily see it. Others may insist on a more technically flawless appearance. The clarity chart below provides a general guide for evaluating clarity in round diamonds.

round-cut
round-cut

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Carat Weight

Clean Under 10X Magnification

Clean to the Naked Eye ("Eye-Clean")

Visible Blemishes Okay As Long As Not Obvious

< 0.5

FL-SI1

SI2

l1

0.75

FL-VS2

SI1-SI2

l1

1

FL-VS2

SI1

Sl2

1.5

FL-VS1

VS2-SI1

Sl2

2.0 +

FL-VS1

VS2-SI1

Sl2

Round Diamond Alternatives

While round cut diamonds make for beautiful stones, there are other stones cut in the same round shape that are stunning as well. Our favorite alternatives to round cut diamonds are round forever one moissanite, and round sapphires. Not only are these round cut alternatives much less expensive than round cut diamonds, they are also very durable and gorgeous.

Round Cut Diamond - $$$$

Round Cut White Sapphire - $$$

Round Cut Moissanite - $$

Settings that Pair Well with Round Cut Diamonds

Almost all engagement rings are originally designed for round cut diamonds, so naturally the majority of engagement rings look beautiful with round stones. However, some designs showcase and balance round diamonds better than others. Here are a few of our favorite round diamond engagement rings.

Money Tips

When looking for a round cut diamond, make sure to always try to maximize measurements within your ideally cut diamond. For example, you can have a 1.0 carat diamond with measurements 6.36 x 6.42 mm that is ideally cut. You could also have a 0.98 carat diamond with measurements 6.45 x 6.45 mm that is just as ideally cut that is probably cheaper. The second option may be a better option.

3 Things to Ask Your Jeweler

  • 01.

    Photo & Video

    Always ask the jeweler you are buying from for a detailed picture or video like this one.

  • 02.

    Inspect It

    Ask the jeweler to pull the diamond and actually visually inspect it.

  • 03.

    Measure It

    Make sure your diamond’s measurements are maximized within your carat size.

See Our Talia

With a Round Cut Diamond

See Our Patronus

With a Round Cut Diamond

See Our Diana

With a Round Cut Diamond

Other Ring Resources

See our in-depth educational guides, which were made to give practical advice with every aspect of your ring.

Diamonds

diamond

Moissanite

moissinite

Sapphires

sapphire

Gold Palladium & Platinum

gold-pallidium-platinum