Round vs Princess Cut Diamonds: Sparkle, Price & Style Compared
Is it the round cut engagement ring, with all its classic heritage, or the princess cut engagement ring, with its bold, geometric, modern edge- which one is going to end up as the permanent companion on your finger? You're not sure, right? That's exactly why you're here.
Think of round cut and princess cut as two of the biggest rivals in the diamond world, both going after the same spot: your finger. Before we let them compete, let's get one thing straight: this isn't going to be a biased match.
Neither shape is "better" than the other. This is purely about which one suits you, your budget, and your lifestyle. And the easiest way to figure that out is to know exactly how these two stack up against each other, category by category. So let's get into it.
The Scorecard: Round Cut vs. Princess Cut Engagement Ring

Before these two go head-to-head in detail, here's the quick tale of the tape.
|
Round Cut |
Princess Cut |
|
|
Shape |
Circular |
Square (occasionally slightly rectangular) |
|
Facets |
57–58, standardized |
Typically 58–76+, varies by cutter |
|
Brilliance |
The benchmark for maximum sparkle |
Strong, more graphic "flash" pattern |
|
Price (same carat, color, clarity) |
Highest of the two |
Typically 20–35% less |
|
Corner durability |
No corners, the most chip-resistant popular shape |
Sharp 90° corners need protection |
|
Cut grading |
GIA issues an official cut grade |
GIA doesn't grade cut quality; AGS does |
|
2026 market share |
~26%, the most-purchased shape |
Roughly single digits, no longer the runner-up |
Table's set. Now let's break down why each of those rows is actually true, starting with what these two shapes are even made of.
Meet the Contenders: What Each Shape Actually Is
In one corner: there is the round brilliant. It's exactly what it sounds like, a circular diamond cut with 57 or 58 facets, arranged in a pattern that has only one goal: bounce as much light back out of the top of the stone as physically possible.
It's the most studied, most mathematically optimized cut in the industry, and that pedigree is a big part of why it performs the way it does.
In the other corner: there is the princess cut, the newer challenger. Developed in the second half of the twentieth century. The princess cut diamond was built to bring brilliant-style sparkle into a square silhouette. Look at it from one side, and you'll notice it isn't flat underneath; it's shaped almost like an inverted pyramid, with beveled corners and a mix of brilliant-style and step-cut facets on the pavilion.
Facet counts are more here than it does for round diamonds, usually landing anywhere from the high 50s into the 70s depending on the individual cutter. This structural facet difference is what sets these two apart in every way: price, appearance, durability, and perceived size.
Face-Off: Which One Sparkles More?
A well-cut round brilliant diamond is the benchmark for light performance, and no fancy shape, princess included, can match it. But "more brilliant" isn't a "better sparkle,” and this is where the princess cut diamond earns its fans.
Because of its mixed facet structure, a princess cut diamond throws light in a more geometric, high-contrast pattern. It throws an "X" of flash instead of the even glow you get from a round diamond. Compare the two side by side under the same light, and you'll notice the round diamond seems to glow evenly all over, while the princess cut throws sharper flashes.
Does Princess Cut Look Smaller Than Round?
You’ve probably heard somewhere that a princess cut diamond looks a little bit bigger than a round cut diamond of the same carat weight. But don't fall for that vague claim!
Face-to-face and carat-for-carat, the top surface area of the diamond (the part you actually see once the stone is set in a ring) of a princess cut looks about 10% smaller than a round diamond of equal weight.
Sounds like a strike against the princess cut, right? But measure the two diagonal corner-to-corner across the princess cut versus straight across the round diamond's diameter, and the princess cut typically measures around 15% longer.
This is an optical illusion: because a princess cut stretches its diagonal corners further than a round diamond's edge, it can appear similar in size or even larger, even though it technically covers less overall surface area. Here is how the two shapes line up at common carat weights:
|
Carat Weight |
Round Diameter |
Princess Side Length |
|
0.50 ct |
~5.1 mm |
~4.3 mm |
|
0.75 ct |
~5.7–5.8 mm |
~5.0 mm |
|
1.00 ct |
~6.4–6.5 mm |
~5.5 mm |
|
1.50 ct |
~7.3–7.4 mm |
~6.3 mm |
|
2.00 ct |
~8.0–8.1 mm |
~7.0 mm |
Why Does a Princess Cut Engagement Ring Cost Less?
A princess cut diamond usually costs less than a round diamond, not because it is lower in quality, but because it is easier to cut from a rough diamond.
A diamond’s price is mainly based on its cut, clarity, color, and carat weight. If you compare a princess cut and a round diamond with the same quality and carat weight, the princess cut will often be less expensive.
The reason starts with the rough diamond. Many rough diamonds naturally form an octahedron shape, which looks like two pyramids joined at their bases. When a cutter splits this shape in half, the two pieces are already close to the basic shape needed for a princess cut.
Because of this, cutters can keep about 70–80% of the rough diamond when creating a princess cut. A round diamond usually keeps only around 50% because much more of the rough stone has to be removed to create its round shape. Less wasted diamond means lower cutting costs. Those savings can then be passed on to the buyer.
Princess cut diamonds also tend to have lower consumer demand than round diamonds. When you combine less material waste with lower demand, a princess cut can often cost around 20–35% less than a round diamond of the same carat weight, color, and clarity.
Durability: Which One Holds Up Better in the Long Run?
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Round cut engagement ring: A round diamond has no sharp corners, so there are fewer weak points where it can chip. This makes it one of the most durable diamond shapes for everyday wear.
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Princess cut engagement ring: A princess cut has four sharp corners. These corners are more exposed and can chip if the diamond gets a hard hit, for example, against a door, countertop, or car door. The sharp corners simply need a little more protection than the smooth edge of a round diamond.
This doesn't mean a princess cut is fragile. It just means you need to be a little more careful with it, especially if you have a hands-on job or often bump your hands into things.
This is something that can surprise buyers, and it may affect your decision when choosing a princess cut engagement ring.
Cut, Quality and Certification
GIA, one of the most trusted diamond grading labs, gives an overall cut grade, from Excellent to Poor, but only for round brilliant diamonds.
That doesn't mean GIA doesn't grade princess cut diamonds. A GIA report for a princess cut will still show things like polish and symmetry. However, it does not give the diamond an overall cut grade.
So, if a jewelry store describes a GIA-certified princess cut as having an “Excellent cut,” that rating did not come from GIA. It is the retailer's own assessment or comes from another source. That isn't a problem, but it means there isn't one universal GIA cut grade backing up that claim.
This makes choosing a princess cut engagement ring a little different from choosing a round diamond engagement ring. If cut quality is important to you, look for additional information about how the diamond handles light.
AGS Laboratories grades the cut quality of princess cut diamonds by looking at how the diamond handles light, not just its measurements. ASET or Ideal-Scope images can help you see how light travels through the stone instead of relying only on a label like “Excellent.” You can also ask your jewelers which lab or expert evaluated the diamond's cut.
Which One Is More Durable?
A round diamond has no sharp corners, so there is less risk of chipping if it gets hit. Because of this, it works well with almost any setting, including prong, bezel, and tension settings. That's a big advantage if you or your partner already have a setting style in mind and the diamond shape isn't the main priority.
A princess cut needs a little more protection because of its four sharp corners. Regular prongs aren't always enough. It is usually better to use V-prongs or double prongs, which are specially designed to cover and protect the corners.
A bezel setting is another good option because it surrounds the diamond with metal and protects its edges. There is also something else to think about: how the engagement ring sits with a wedding band.
The straight edges of a princess cut can sit neatly against a straight or channel-set wedding band, usually leaving little or no gap. A round diamond has a curved edge, so it can leave a small space between the engagement ring and a straight wedding band. That's why round diamond rings are often paired with a curved or notched wedding band that fits around the diamond.
Which Shape Fits Your Style?
Choosing a diamond shape is really about what you like. Round cut diamond engagement rings have a classic look and work well with almost any style. Princess cut diamond engagement rings have a more modern look and are a good choice if you prefer bold designs.
Popularity and Resale Value in 2026
You may have heard that princess cut is the second most popular diamond shape for engagement rings. That used to be true, but it is no longer accurate.
Round cut engagement rings are still the most popular choice, with about one in four buyers choosing it. Oval diamond engagement rings have also become very popular and are now close behind round. Princess cut engagement rings have become less common and now have a similar level of popularity to emerald, pear, and marquise shapes.
When it comes to resale, round diamond rings usually have an advantage because more people are looking for them. Princess cut rings have a smaller group of potential buyers, so they may sell for a lower percentage of their original price.
However, resale value depends on more than just the shape. The diamond's quality, certification, and the market at the time of resale can all make a difference.
Which One Should You Buy: Princess Or Round Cut Engagement Ring
There's no universal winner in this match. But there is a winner for you, and figuring out which one comes down to what you're actually optimizing for.
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If budget is calling the shots, a princess cut engagement ring generally gets you more carat, or better color and clarity, for the same money.
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If durability for daily wear is your top concern, a round cut engagement ring is the lower-maintenance pick, or a princess cut set in a full bezel or double-V-prong mounting, if you've genuinely fallen for the shape anyway.
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If resale value or long-term liquidity matters to you, round cut has the stronger track record.
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If you want a distinctive, modern look, a princess cut engagement ring delivers that in a way a round diamond engagement ring doesn't.
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If you want certainty about cut quality without extra digging, round cut is the easier road. Going for princess? Look specifically for an AGS grade or a light-performance image before you commit.
