Radiant Cut Diamonds - A Guide to Radiant Cut Diamonds - Do Amore

Radiant Cut Diamonds

A radiant cut diamond has 70 facets, making them one of the most faceted diamond shapes available. Radiant cut diamonds are also very unique. In fact, at the time of writing this article, less than 1.6% of diamonds for sale globally were radiant cut (17,895 radiant cut diamonds out of 1,178,007 total diamonds).

Table, Depth & Other Specifications for Ideal Radiant Cut Diamonds

The GIA does not grade radiant cut diamonds, or other fancy shaped diamonds, for cut grade. If you see a cut grade associated with an radiant cut diamond, it is a cut grade that the jeweler is assigning to the diamond themselves. While this is okay, you should always verify the cut a jeweler provides since they can make mistakes in determining the cut rating since they don’t have a certificate to rely on.

For these reasons, and because how well a diamond is cut is the most crucial factor in maximizing the beauty, you want to make sure you understand the ideal cut specifications. The table below serves as a general guideline for evaluating the cut of a radiant diamond.

radiant

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Ideal/Excellent Cut (Most Sparkle)

Very Good

Good

Table %

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

62-69

58-61 or 70-72

55-57 or 73-74

Depth %

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

61.0 - 66.5

58.5-60.9 or 66.6-70.0

56.5-58.4 or 70.1-73.0

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

Very Thin to Slightly Thick

Very Thin - Thick

Culet

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

None

Very Small

Very Small

Length to Width Ratio

The length of a diamond divided by its width. When comparing diamonds, those with larger ratios appear more rectangular (less square)

1.20-1.35

1.15-1.19 or 1.36-1.40

1.11-1.14 or 1.41-1.45

Color Recommendations for Radiant Cut Diamonds

The color grade of a radiant cut diamond refers to how much color (or lack of a color) the diamond shows. Smaller radiant cut stones hide color better than larger radiants do, so depending on the size of diamond you purchase, you may not need to buy a colorless (D-F) diamond even if you want your diamond to appear colorless. The chart below will help you decide on the color grade of radiant cut diamond to purchase based on if you want a colorless diamond, a diamond with limited color, or a warmer diamond.

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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 Radiant Cut Diamonds

The clarity grade of a radiant cut diamond is based on how many and how severe the imperfections are on the diamond. It’s harder to see flaws on smaller radiant diamonds than larger ones, so if you are buying a smaller stone you can get away with purchasing one with a lower clarity rating while keeping an eye-clean appearance. In addition, because radiant cut diamonds have so many facets and a lot of sparkle, they hide blemishes fairly well especially in compare to their emerald cut counterparts.

Evaluating clarity in radiant cut diamonds is subjective because each consumer has their own standard for clarity. Some may be perfectly comfortable with inclusions as long as they cannot easily see it, but other may insist on a more technically flawless appearance. The clarity chart below provides general guidelines for picking a clarity rating for your radiant cut diamond, based on your inclusion tolerance. Please note that the ratings in the Clean to the Naked Eye column assume that your jeweler will check to ensure it is actually eye-clean. For example, every time a customer purchases a diamond from us, we send a gemologist to check and make sure it is “eye-clean” and inform the customer if it isn’t. If you want an eye clean stone, make sure you ask your jeweler to do the same.

radiant
radiant

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Carat Weight

Clean Under 10X Magnification

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

Visible Blemishes Okay As Long As Not Very Obvious

< 0.5

FL-SI1

SI2

l1

0.75

FL-VS2

SI1-SI2

l1

1

FL-VS2

VS2-SI1

Sl2

1.5

FL-VS1

VS2-SI1

Sl2

2.0 +

FL-VS1

VS2-SI1

Sl2

Length to Width Ratio for Radiant Cut Diamonds

All radiant cut diamonds in our diamond search engine have the length to width ratio listed. This ratio, which is simply the length divided by the width, determines how skinny or wide the radiant diamond is. The larger the length to width ratio means the diamond is much longer than it is wide (a more rectangular radiant cut diamond). The smaller the length to width ratio means the length isn’t that much greater than it’s width (a more square radiant cut diamond). Our personal favorite range for pear shaped diamonds is 1.40-1.60.

Note about Pear Shaped Halo Engagement Rings: If you opt to set your pear shaped diamond in a halo setting, then the diamond will end up looking wider! This is because the halo gives the illusion of a wider pear cut diamond with a smaller length to width ratio. To avoid having your diamond from looking too wide, if purchasing a halo engagement ring then you may want to opt for a pear shaped diamond with a higher length to width ratio. Or just let us (or your jeweler) know you are opting for a halo engagement ring so we can find diamonds that will look beautiful and proportional within a halo setting.

1.15

1.25

1.35

Settings that Pair Well with Radiant Cut Diamonds

Radiant cut diamonds pair well with most rings, however, their unique shape means they don’t flow well with every ring design. The below rings are a few of our favorite radiant cut engagement rings that would be at the top of our list if purchasing a radiant diamond. These radiant cut engagement rings are available in all metals, including 14k white gold, yellow gold, rose gold, palladium, and platinum.

Money Tips

When looking for a radiant cut diamond, make sure to always try to maximize measurements within your ideally cut diamond. For example, you can have a 1.0 carat radiant cut diamond with the measurements 6.5 x 5.0 mm that is ideally cut. But there could also be a 0.98 carat radiant cut diamond with measurements 6.6 x 5.1 mm that is just as ideally cut that is probably cheaper. If all else were equal, the second option may be a better option. All diamonds in our “hand selected” stone section above have had their dimensions reviewed to make sure they were being maximized for their carat weight, while maintaining an ideal cut.

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 your radiant cut diamond.

  • 03.

    Measure It

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

See Our Mekelle Band

With a Radiant 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

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Moissanite

moissinite

Sapphires

sapphire

Gold Palladium & Platinum

gold-pallidium-platinum