Princess Cut Diamond Ring Guide: How to Choose One That Sparkles and Lasts

on Oct 22 2026
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    A princess-cut diamond ring is a great choice, but there are two things you should look for: how well the diamond sparkles and how well its four corners are protected.

    Not all princess-cut diamonds sparkle the same way. Two diamonds can have the same carat weight, color, clarity, and type of certificate, yet look completely different. One may shine brightly across the whole stone, while the other has dull spots because light escapes through the bottom.

    With round diamonds, a lab’s cut grade can help you judge how well a diamond will sparkle. With princess-cut diamonds, you usually need to look beyond the grade. The other thing to consider is the diamond’s shape. Its sharp, square corners give it a clean, modern look, but they can also chip more easily if they get knocked.

    The good news is that you can avoid these issues by choosing carefully. Pick a diamond that sparkles well and a setting that protects its corners. You’ll get a beautiful, bright square diamond that can also cost less per carat than a round diamond of similar quality.

    Is a Princess Cut Diamond Ring Right for You?

    Elegant botanical engagement ring featuring a large rectangular Radiant, Marquise and round diamond ring in prong-set in yellow gold, creating a leafy vine band

    A princess-cut diamond is square, though some are slightly rectangular. Its many facets reflect light and give it plenty of sparkle, while its four pointed corners create a modern look. It is also known as a square modified brilliant.

    This diamond shape works well in several ring styles, including solitaire, halo, and three-stone settings.  What makes the princess cut stand out is its geometric shape. Unlike the softer curves of round and oval diamonds, it has a bold appearance while still offering plenty of sparkle.

    Princess-cut diamonds are also less popular than they once were. Recent surveys from The Knot suggest that they account for around 8% to 10% of engagement rings, putting them well behind round and oval diamonds. 

    How to Choose the Princess Diamond: Five Checks That Matter 

    The 4Cs- carat, cut, color, and clarity- matter for princess-cut diamonds just as they do for any other diamond. But this shape has a few extra things to consider. These five checks will help you understand what separates a high-quality diamond from one that may not look as good as you expect.

    1. Cut quality: What the certificate doesn't tell you

    Cut quality affects how a diamond reflects light and how much it sparkles. A well-cut diamond looks bright and lively, while a poorly cut one can appear dull. Of the 4Cs, cut has the greatest effect on sparkle.

    For round diamonds, GIA provides a cut grade ranging from Excellent to Poor. This helps you judge how well a diamond is cut. However, GIA's overall cut grade applies to round brilliant diamonds, not princess cuts.

    A GIA report for a princess-cut diamond includes polish and symmetry grades. These tell you how well the diamond's surfaces and facets have been finished, but they don't show how well the stone reflects light.

    Some other grading labs have offered cut grades for princess-cut diamonds and other fancy shapes. AGS Laboratories introduced a light-performance cut grade for princess cuts in 2005, while IGI and GCAL have also offered cut grades for fancy shapes. 

    Because grading services can change, check what the report for your diamond actually covers. You can find more information on the AGS Laboratories and IGI websites.

    If the certificate doesn't include a cut grade, or you're comparing several diamonds, these three steps can help:

    1. Look for an independent cut grade: If your budget allows, choose a diamond that has been assessed for cut quality by a grading lab that offers this service.

    2. Ask for an ASET image or a clear video: An ASET image uses different colors to show how a diamond handles light. A well-performing princess cut should have a balanced pattern without large areas that appear dark or washed out. A video also lets you see how the diamond sparkles as it moves.

    3. Use the diamond's measurements as a starting point: Its proportions can help you narrow down your options, but they don't tell the whole story. If a seller gives a diamond an “Excellent” cut rating based only on its measurements, don't assume it will have great sparkle. Look at its light performance, too.

    These measurements can help you compare princess-cut diamonds and narrow down your options.

    Measurement

    Common range

    What it means

    Table % (width of the flat top)

    About 65%–75%, with 67%–72% often preferred

    A table that is too large may make the diamond look glassy rather than bright and sparkly.

    Depth % (how deep the diamond is compared with its width)

    About 64%–75%

    A diamond that is too shallow may lose light, while one that is too deep may look smaller than expected for its weight.

    Length-to-width ratio (length compared with width)

    1.00–1.05

    Helps you tell whether the diamond looks square or slightly rectangular.

    You may find different recommended ranges in different guides because there is no single agreed standard for the ideal proportions of a princess-cut diamond.

    Use these numbers to narrow down your choices, but don't rely on them alone. A diamond can fall within all the recommended ranges and still lack sparkle. An ASET image or a clear video can help you see how well the stone handles light.

    One common rule of thumb is to choose a diamond with a table percentage smaller than its depth percentage. This can be a useful starting point, but it doesn't guarantee good sparkle.

    2. Shape: How square is the diamond?

    A length-to-width ratio between 1.00 and 1.05 usually means a diamond looks square. To calculate the ratio, divide the longer measurement by the shorter one.

    For example, a diamond measuring 5.50 mm by 5.90 mm has a ratio of about 1.07. This means it will look slightly rectangular rather than perfectly square.

    Adding smaller diamonds on either side of the center stone can make it look wider. If you like this style, see the diamond in its setting before making a decision. A slightly rectangular diamond shape may even help you save money

    3. Corners: Check for weak spots and inclusions

    The girdle is the narrow edge around a diamond where the top and bottom meet. On a princess-cut diamond, this edge can be very thin at the four corners, making them more likely to chip if the ring gets knocked. Ask about the girdle thickness at the corners and check for any flaws nearby.

    One thing to look for is a feather, a small crack-like mark inside the diamond. If it extends toward a corner, it may make that area more likely to chip. A small crystal inclusion near the center of the diamond is generally less concerning when it comes to durability.

    The good news is that princess-cut diamonds can hide small flaws well because of the way their facets are arranged. The prongs that cover the corners may also hide minor flaws in those areas.

    Many retailers recommend SI1 clarity as a good balance between appearance and price. However, a clarity grade alone won't tell you whether a diamond looks clean to the naked eye. Every stone is different, so check it in a clear, high-quality video to see whether any flaws are visible.

    4. Color: Check the corners carefully

    Princess-cut diamonds can show more color around the corners than in the center. A diamond may look bright and white in the middle but have a slight yellow or warm tint near the edges.

    The metal you choose for the ring can affect how noticeable this tint is. White gold and platinum can make yellow tones easier to see, so choosing a higher color grade may be worth the extra cost. Yellow and rose gold can blend better with a diamond that has a slight warm tint, allowing you to choose a lower color grade and potentially save money.

    If your ring includes smaller diamonds alongside the center stone, try to choose stones with a similar color. This helps the ring look more even.

    5. Carat weight vs. how large the diamond looks

    You may hear that a princess-cut diamond looks larger than a round diamond of the same carat weight. But that isn't always the case. Its visible size depends on how the diamond is cut.

    Carat weight tells you how much a diamond weighs, not how large it looks from above. A diamond that is cut too deep carries more of its weight underneath, where you can't see it when looking at the ring.

    As a result, two one-carat princess-cut diamonds can look different in size when worn. Before buying, compare their measurements in millimeters and their length-to-width ratios instead of relying on carat weight alone.

    Our princess-cut diamond size chart can help you see how these measurements affect the diamond's appearance on your finger.

    Protecting the Four Corners: How to Choose the Right Setting

    Diamonds are the hardest natural material, so you might wonder why a princess-cut diamond needs extra protection. The reason is simple: being hard to scratch doesn't mean a diamond can't chip.

    A diamond's hardness helps protect it from scratches, while its toughness affects how well it handles knocks and impacts. The four pointed corners of a princess-cut diamond are vulnerable because they are exposed and can chip if hit at the wrong angle. 

    Chips can happen during everyday activities, such as knocking your hand against a doorframe, countertop, or car door. A good ring setting helps protect the diamond by placing metal around its corners, reducing the chance of damage.

    Setting

    How it protects the corners

    Trade-off

    Good for

    V-prong

    A V-shaped prong wraps around each corner like a cap

    Covers a small part of each corner

    Most solitaires and everyday wear with normal care

    Bezel (full or partial)

    A metal rim surrounds the edge of the stone

    Covers more of the diamond and lets in slightly less light

    Hard-working hands and active lifestyles

    Halo

    A ring of small diamonds surrounds the center stone

    Corners still depend on the prongs; more small stones to maintain

    Making the center stone look larger

    Three-stone

    Side stones flank the center

    The center stone’s corners still need protective prongs

    A balanced, symmetrical look

    Channel or pavé band

    Accent stones sit between metal walls or small beads

    Protects the accents, not the center stone

    The band rather than the center stone

    What a Princess-Cut Diamond Ring Costs and Where to Spend Your Money

    Princess-cut diamonds often cost less per carat than round diamonds because less rough diamond is wasted when cutting this shape. The square shape fits more efficiently into a rough diamond crystal, while round diamonds usually require more of the rough stone to be cut away.

    Some retailers estimate that princess-cut diamonds can cost around 20% to 30% less per carat than similar round diamonds. Blue Nile, for example, says the savings can reach 25% for diamonds of comparable weight and quality.

    Here's a simple example. If a round diamond costs $5,000, a similar princess-cut diamond might cost around $3,500 to $4,000. These are just example figures, though. The actual price difference depends on the diamond's cut quality and current market prices. Always compare diamonds with similar characteristics before deciding.

    Keep in mind that a lower price doesn't always mean a better deal. Some princess-cut diamonds are cut to keep more of the original stone's weight rather than to give you the best sparkle. This can lead to big differences in quality and price.

    It's better to use the money you save to buy a well-cut diamond than to simply choose a larger carat weight. A bigger diamond won't necessarily look brighter or more beautiful.

    Here's how to prioritize your budget:

    1. Cut quality and a protective setting first. A well-cut diamond gives you better sparkle, while the right setting helps protect its four corners.

    2. Choose the right color for your ring metal. The metal can affect how noticeable a diamond's color looks. See the color section above for more details.

    3. Choose only as much clarity as you need. You don't always need a high clarity grade if the diamond looks clean to the naked eye.

    4. Consider carat weight last. Diamond prices often jump at popular weights, such as 1.00 carat. A diamond just under that weight may cost less. Also, check how large it looks from above instead of focusing only on the carat number.

    For a more detailed breakdown of prices, see our princess-cut ring pricing guide.

    Living With a Princess-Cut Ring: Care and Repairs

    Taking care of your princess-cut diamond ring is simple. Soak it in warm water with a little mild dish soap. Gently clean around and behind the diamond with a soft toothbrush, rinse it well, and pat it dry with a clean cloth.

    Remove your ring before heavy lifting, gardening, or using strong cleaning chemicals. This helps protect the diamond and its setting from damage.

    Have a jeweler check the prongs at least once a year, or twice a year if you wear the ring every day. If the diamond starts to feel loose or you hear a rattling sound, stop wearing the ring and have it checked before putting it back on.

    If one of the corners chips, the repair will depend on how bad the damage is. A small chip may be fixed by polishing the affected area. A larger chip might require the diamond to be cut again, which can reduce its weight and change its shape slightly.

    Before buying the ring, check whether the warranty or insurance covers chips and other damage. Not every policy includes this type of repair. Our ring care guide covers cleaning, regular maintenance, and ways to help prevent chips.

    Frequently Asked Questions

    Usually, yes, if it has a plain band. A solitaire can typically be resized by a size or two. Bands with channel-set or pavé stones along much of their length are harder, and eternity-style bands may not be resizable at all. Ask the jeweler about resizing before you buy.

    It depends on how high the center stone sits. A straight band lies flush against a low V-prong solitaire. If the setting sits higher or has a halo, a curved, notched, or contoured band fits around it. Bring your engagement ring when you try bands, and leave a small gap if the metal would rub against the prongs.

    Yes, but it needs a careful jeweler. The corners are most at risk when the stone is removed and reseated, so choose someone who works with fancy shapes. Because princess cuts vary in size and ratio, the new setting should be made to the stone’s exact measurements. Have the corners checked for existing chips first.

    Yes. Get an independent appraisal, then check that the policy covers loss, theft, and accidental damage, including chips. Ask whether it pays replacement value or actual cash value. Standard homeowners or renters policies often cap jewelry coverage, so confirm your limit. Re-appraise every few years, since values change.

    It can. A square outline reads wider than a round or oval of similar weight, so a moderate stone size and a slimmer band often look balanced on small or short fingers. Some people set the stone turned 45° so a corner points along the finger, which can lengthen the line. Try on a few options.

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    Diagaa Jewelry is dedicated to creating exquisite diamond jewelery while helping customers make confident choices. Our experts share insights on diamonds, engagement rings, wedding jewelery, and gifting trends to inspire every special occasion.

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