Ideal Proportions

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Ideal Cuts

<table style="border-collapse:collapse;width: 100%;"><tbody><tr><td style="width: 18.7108%;">Shape </td>
	<td style="width: 81.1996%;">Radiant cut diamonds are among the most popular diamond shapes.&nbsp;They emit incredible fire and brilliance and have 70 facets with a brilliant cut pattern. </td></tr>
<tr>
	<td>Cut </td>
	<td>While analyzing the cut, look for a 57-69% table and a
 58-70% depth. Review the chart below carefully for exact proportions and other
 critical information related to cut. </td></tr>
<tr>
	<td>L/W Ratio </td>
	<td>We recommend a length-to-width ratio of 1-1.05 for
 square and 1.16-1.3 for rectangular, depending on your preference.&nbsp;Make sure you are familiar with square and
 rectangular radiant cut diamonds. The image below illustrates a range of ratios. </td></tr>
<tr>
	<td>Color </td>
	<td>While D, E F are colorless grades, G is also an exceptional color grade. H and I are great budget options. </td></tr>
<tr>
	<td>Clarity </td>
	<td>Flawless to VS1 are considered top clarity grades, and VS2 is also excellent. SI1 is often a great choice for buyers with budget constraints, as it offers a high level of clarity that is eye-clean. However, when considering SI2 diamonds, carefully evaluate them to ensure they are eye-clean. </td></tr><tr>
	<td>Certification </td>
	<td>Buy a radiant cut diamond graded by the&nbsp;<a href="https://www.petragems.com/education/gia-vs-ags/">GIA or the AGS</a>. Review the section below on how to read a grading report carefully. </td></tr>
<tr>
	<td>Settings </td>
	<td>Radiant cut diamonds fit nicely into swirl, infinity, and cathedral settings. Classis designs are also a good fit. Here is a list of our top&nbsp;<a href="https://www.petragems.com/radiant-engagement-rings/">radiant cut engagement rings</a>. </td></tr>

<tr>
	<td>Best Places </td>
	<td>Here is a list of our&nbsp;<a href="https://www.petragems.com/education/best-place-to-buy-diamonds-or-engagement-rings-online/">top websites for diamond and engagement rings</a>&nbsp;to
 consider. </td></tr></tbody></table>

Radiant Cut Diamond Highlights

The chart below serves as a general guideline when evaluating the cut of a radiant diamond. The length-to-width ratio of 1.00-1.04 for square shapes and 1.20-1.31 for rectangular shapes is considered classic, though personal preference could override it.<a href="https://www.jamesallen.com/loose-diamonds/radiant-cut/?a_aid=5c83f22427304" target="_blank"><img loading="lazy" class="img-responsive" src="https://backend.petragems.com/public/api/Images/Picture82.webp" alt="radiant cut diamonds ratio" width="748" height="254" title="radiant cut diamonds"></a>The radiant cut might be best if you appreciate <a href="https://www.petragems.com/education/emerald-cut-diamonds/">emerald cuts</a>' classic appeal and <a href="https://www.petragems.com/round-cut-diamonds/">round diamonds</a>' radiance. It perfectly combines a round diamond's brilliance and an emerald diamond's elegance. Moreover, if a blend of a&nbsp;<a href="https://www.petragems.com/education/radiant-vs-cushion-vs-princess-cut-diamond/">cushion and a princess cut</a>&nbsp;is desired, explore its cropped corner square alternative, the radiant cut. The smooth transition between the cushion and princess cut gives it a beautiful appearance, especially when set with either round or square corners.Tools like this&nbsp;<a href="https://www.jamesallen.com/loose-diamonds/all-diamonds/?a_aid=5c83f22427304" class="external" rel="nofollow">40X Magnified Video</a>&nbsp;technology can be very helpful in assessing how a change in proportions and length-to-width ratios affects the appearance of a radiant cut diamond. Buyers can better assess each stone by using the outlined proportions below and experimenting with the diamond search filters. <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="780">
 <tbody>
 <tr>
 <td valign="top" style="width: 24.9565%;">
 Depth %
 Poor/Fair: &lt;52 or &gt;80 / 52-80
 Good: 57-59 / 71-74.5
 Very Good: 58.8-70/67-70.1
 Excellent: 61.3-67
 </td>
 <td valign="top" style="width: 29.6522%;">
 Table %
 Poor/Fair:&nbsp;&lt;50 or &gt;80/50-52.5 or 75.5-80
 Good: 53-57/74
 Very Good: 58-61/71
 Excellent: 62-70
 </td>
 </tr>
 <tr>
 <td valign="top">
 Culet
 Poor/Fair: Large/Very Large
 Good: Medium
 Very Good: None/Very Small
 Excellent: None
 </td>
 <td valign="top">
 Girdle
 Poor/Fair: Ex. Thin – Ex. Thick
 Good: Very thin - thick
 Very Good: Very thin - slightly thick
 Excellent: Very thin - slightly thick
 </td>
 </tr>
 <tr>
 <td valign="top">
 L/W Square Cut
 Poor/Fair: &gt;1.09 /1.07-1.09
 Good: 1.05-1.06
 Very Good: 1.00-1.04
 Excellent: 1.00-1.04
 </td>
 <td valign="top">
 L/W Rectangular Cut
 Poor/Fair: &lt;1.08 or &gt;1.41/1.07-1.08
 Good: 1.09-1.13/1.37-1.41
 Very Good: 1.14-1.20/1.32-1.36
 Excellent: 1.20-1.31
 </td>
 </tr>
 </tbody>
</table>

Radiant Cut Proportions

Like evaluating the
 color in other diamond shapes, the color in a radiant cut diamond is critical.
 The higher the color grade, the better. In our experience, many buyers prefer
 warmer colors over colorless options due to the price difference. The warmer
 colors refer to the near-colorless range of G to I color diamonds in the color
 spectrum, while the colorless ones refer to <a href="https://www.petragems.com/education/colorless-diamonds-d-e-f-color/">D to F color diamonds</a>. The price
 premium would be much lower if you want to get a lower color grade radiant cut
 diamond at a lower price.<a href="https://www.petragems.com/education/diamond-color/"><img loading="lazy" class="img-responsive" src="https://backend.petragems.com/public/api/Images/Picture51.webp" alt="Diamond Color Chart with Details" width="702px" height="372px" title="Diamond Color Chart"></a>

For more detailed
 information on the color of radiant cut diamonds, use the table below.

<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="780" style="width: 99.3733%; margin-left: 0.895255%;">
 <tbody>
 <tr>
 <td valign="top" style="width: 21.9378%;">
 &lt; 0.50 Carat
 Poor/Fair: &gt;M/ L-M
 Good: I-K
 Very Good: G-I
 Excellent: D-G
 </td>
 <td valign="top" style="width: 20.1097%;">
 0.51 – 1.0 Carat
 Poor/Fair: J-K / &gt;L
 Good: I
 Very Good: H
 Excellent: D-G
 </td>
 </tr>
 <tr>
 <td valign="top">
 1.0 – 2.0 Carat
 Poor/Fair: J-K / &gt;I
 Good: H-I
 Very Good: G
 Excellent: D-F
 </td>
 <td valign="top">
 &gt;2.0 Carat
 Poor/Fair: I-K / &gt;I
 Good: I-H
 Very Good: F-G
 Excellent: D-E
 </td>
 </tr>
 <tr>
 <td valign="top" colspan="2">
 Fluorescence
 Poor/Fair: Very/Strong
 Good: Medium
 Very Good: Faint/None
 Excellent: None
 </td>
 
 </tr>
 </tbody>
</table>

Color in Radiant Diamonds

Picking clarity is a subjective decision when selecting a radiant cut diamond. Opt for one that aligns with your personal standards. Our customers hold diverse criteria for <a href="https://www.petragems.com/education/diamond-color-vs-clarity/">clarity and color</a>: some prefer flawless diamonds, while others find slight inclusions acceptable if&nbsp;they aren't readily apparent. Based on our extensive experience, any clarity grade above SI1 (according to GIA standards) will be considered excellent.

<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="780">
 <tbody>
 <tr>
 <td valign="top" style="width: 20.2609%;">
 &lt; 0.50 Carat
 Poor/Fair: I2 / &gt;I2
 Good: SI2
 Very Good: SI1-SI2
 Excellent: FL-VS2
 </td>
 <td valign="top" style="width: 18.3478%;">
 0.51 – 1.0 Carat
 Poor/Fair: I2 / &gt;I2
 Good: SI2
 Very Good: SI1-SI2
 Excellent: FL-VS2
 </td>
 </tr>
 <tr>
 <td valign="top">
 1.0 – 2.0 Carat
 Poor/Fair: SI2-I1 / &gt;I1
 Good: SI1-SI2
 Very Good: WS2-VS2
 Excellent: FL-VS1
 </td>
 <td valign="top">
 &gt;2.0 Carat
 Poor/Fair: &gt;SI2
 Good: SI1-SI2
 Very Good: VS1-SI1
 Excellent: FL-WS2
 </td>
 </tr>
 </tbody>
</table>

Clarity in Radiant Cut Diamonds

In addition to the renowned 4Cs, buyers should be familiar with the subsequent key facets of a radiant cut diamond grading report or certificate, as illuminated in the image below.<img loading="lazy" class="img-responsive" src="https://backend.petragems.com/public/api/Images/img-1692981156.webp" alt="Radiant cut GIA grading report" width="899px" height="527px" title="radiant cut diamond certificate" style="width: 899px; height: 527px;"> Watch the <a href="https://www.jamesallen.com/loose-diamonds/radiant-cut/1.51-carat-f-color-vvs2-clarity-sku-16461681?a_aid=5c83f22427304/" class="external" rel="nofollow">HD Video</a> of this Diamond.Measurements: This holds significant importance as it furnishes the buyer with information concerning the surface size of the diamond, thereby indicating the apparent size of the diamond in millimeters. Furthermore, it provides the length-to-width ratio by dividing the length by the width (in this instance, yielding a ratio of 7.69/65.81=1.32).Fluorescence: Regard this as the 5th C. Given the diamond's F color grade, avoiding fluorescence is the optimal choice in this case. However, medium blue fluorescence should not raise as much concern as strong blue fluorescence.Comments: This section will showcase clarity factors and shed light on whether the diamond has undergone clarity enhancement, utilizing methods like laser drilling or color enhancement. Additionally, remain attentive to comments such as "clarity grade based on clouds," a concerning indicator within clarity grades of VS2 and below. The laser inscription of the report number on the girdle is positioned above the comments section (an optional service for enhanced verification).Proportions: This chart assumes utmost importance in evaluating the diamond's cut. Specifically, focus on the table percentage (60% in the given example - excellent), depth percentage (69.2% - very good), girdle (slightly thick- very good), and culet (none - excellent).Clarity Characteristics: This section will delineate the types of inclusions and their respective locations. It proves invaluable for buyers seeking to avoid diamonds with conspicuous inclusions at the center. Furthermore, these details facilitate correlating the report with the diamond, as these inclusions serve as the diamond's distinctive birthmarks.

How to Read a Radiant Cut Grading Report

Suggested carat weight, cut, color, and clarity of radiant cut diamonds for people with budget constraints

Excellent Choice

<ul type="disc">
 <li class="MsoNormal">Weight of&nbsp;1.2&nbsp;Carat+</li>
 <li class="MsoNormal">Very Good to Excellent Polish and Symmetry</li>
 <li class="MsoNormal">G or above in color</li>
 <li class="MsoNormal">Clarity of SI1 or higher</li>
 <li class="MsoNormal">No Fluorescence</li>
 <li class="MsoNormal">Length to Width Ratios: 1.0-1.04 for a square or 1.20-1.35
 for a rectangular shape</li>
</ul>

Very Good Choice

<ul type="disc">
 <li class="MsoNormal">Weight of&nbsp; 0.95&nbsp;Carats+</li>
 <li class="MsoNormal">Good to Excellent Polish and Symmetry</li>
 <li class="MsoNormal">H or above in Color</li>
 <li class="MsoNormal">Clarity of SI1 or higher</li>
 <li class="MsoNormal">None, Faint or Medium Blue Fluorescence</li>
 <li class="MsoNormal">Length to Width Ratios:&nbsp;1.0-1.04 for a square or 1.20-1.35
 for a rectangular shape</li>
</ul>

Good Choice

<ul type="disc">
 <li class="MsoNormal">Weight 0.80 Carats</li>
 <li class="MsoNormal">Good to Very Good Polish and Symmetry</li>
 <li class="MsoNormal">I or higher in Color</li>
 <li class="MsoNormal">Clarity of SI1 or Higher</li>
 <li class="MsoNormal">None, Faint or Medium Blue Fluorescence</li>
 <li class="MsoNormal">Length to Width Ratios:&nbsp;1.0-1.04 for a square or 1.20-1.35
 for a rectangular shape.</li></ul><img src="	https://backend.petragems.com/public/api/Images/img-1692624540.webp" alt="ideal radiant cut diamond" width="380px" height="244px" title="radiant cut diamond proportions" style="width: 380px; height: 244px;">

Radiant Cut Budget Options

Between the square and rectangular radiant cut diamonds, which one
 is better?

It entirely depends on your budget; we have seen both options in the market. While the elongated ones look more prominent, the square radiant cuts have a beautiful and elegant look to them as well.<a href="https://www.petragems.com/radiant-engagement-rings/"><img loading="lazy" class="img-responsive" src="https://backend.petragems.com/public/api/Images/Picture83.webp" alt="radiant cut diamond engagement rings" width="538px" title="radiant cut engagement rings" style="width: 538px; height: 306px;" height="306px"></a>

What is the best alternative to radiant cut diamonds?

Radiant cut diamonds are alternatives to<a href="https://www.petragems.com/education/emerald-cut-diamonds/"> emerald cut diamonds</a>, which have a step cut and fewer facets. If you want large and deep facets, emerald cut diamonds will be ideal. However, if you desire sparkle and radiance, a radiant cut should be the choice.

Why are radiant cut diamonds cheaper than round-cut diamonds?

They are not necessarily cheaper than <a href="https://www.petragems.com/round-cut-diamonds/">round diamonds</a>. Round diamonds have a large surface area; therefore, a one-carat round diamond requires a bigger rough diamond than a radiant cut. For example, the average surface size of a 1 carat round diamond is about 6.4mm, while it would be in the 5.5mm range for a square radiant cut. So, while they have a similar carat weight, the cutter had to sacrifice a bigger rough diamond to get a 1 carat round diamond than he or she had to for a radiant cut. As a result, the price reflects this difference.

Radiant Cut FAQs

Radiant cut diamonds hold a special place among our preferred diamond shapes. With 70 facets, they exude extraordinary radiance and brilliance. The radiant cut 

Radiant Cut Diamonds: In-depth Guide, Ideal Ratio and Proportions