A princess cut natural diamond engagement ring catches the eye for a reason. The cut delivers sharp, modern lines and a brilliant sparkle that rivals a round diamond, often at a lower price per carat. But before you commit, you need to understand how the shape affects cut quality, setting choice, and long-term wear, because a poorly chosen princess cut can look glassy rather than fiery, or chip at the corners if it’s not protected properly.

This guide answers the practical questions buyers actually ask: what makes a well-cut princess diamond, which settings suit the shape best, and how to judge value when comparing natural stones. You’ll also get a clear sense of what to expect on price, since princess cuts typically offer more diamond for your budget than round brilliants of comparable quality.

We’ll walk through the 4Cs as they apply specifically to princess cuts, the metal and setting styles that keep the corners secure, and the questions worth asking any jeweller before you buy. Whether you’re browsing online or planning a visit to Hatton Garden for a hands-on look, this is what to know before you choose.

Why choose a princess cut for a natural diamond ring

The princess cut sits second only to the round brilliant in popularity, and it’s easy to see why. Its square silhouette gives an engagement ring a crisp, architectural look that round diamonds simply can’t offer, while the faceting underneath still delivers serious sparkle. If you want a stone that reads as modern and bold on the hand but still throws light like a classic diamond, this shape earns its place on your shortlist.

A distinctive shape with round-cut brilliance

Underneath that square top, a well-made princess cut uses a brilliant faceting pattern borrowed from the round cut, typically 58 to 76 facets arranged in an inverted pyramid. This is why a good princess cut natural diamond can rival a round stone for fire and scintillation, despite looking nothing like one from above. The pointed corners also create an elongating effect on the finger that many round and cushion cuts lack.

A well-cut princess diamond gives you round-brilliant sparkle inside a bold, square outline.

More diamond for your money

Because princess cuts retain more of the rough diamond during cutting, there’s less wastage than with a round brilliant, and that saving often passes to you. Buyers regularly report 10 to 25% more carat weight for the same budget compared with an equivalent round stone. That difference matters if you’re chasing a certain look size without stretching past what you’d planned to spend.

Suits a range of styles

A square shape gives you flexibility that round diamonds don’t. It pairs cleanly with a plain solitaire band for a minimalist look, sits beautifully inside a hidden halo for extra sparkle without bulk, and channel-sets side stones align naturally with its straight edges. Whether you lean towards a vintage-inspired setting or something stripped back and contemporary, the princess cut adapts without losing its identity.

How to choose the right princess cut diamond

Cut quality matters most

Getting the cut grade right matters more with a princess diamond than almost any other shape, because poor faceting shows up instantly as a dark, lifeless patch in the centre, often called the bowtie effect. Look for a cut grade of Very Good or Excellent where the certificate offers one, and ask to see the stone under different lighting before you decide.

Cut quality makes or breaks a princess diamond far more than colour or clarity ever will.

Check the ratio, colour and clarity together

Next, check the length-to-width ratio, since this determines whether the stone looks perfectly square or slightly rectangular on the finger. Most buyers prefer a ratio between 1.00 and 1.05 for a true square look. Colour grades of H or above generally look colourless once mounted, and because princess cuts hide inclusions less easily near the centre, aim for VS2 clarity or better.

• Cut grade: Very Good or Excellent
• Ratio: 1.00-1.05 for a square shape
• Colour: H or higher
• Clarity: VS2 or better

Insist on independent certification

Finally, never buy a natural princess cut without an independent grading report from GIA or IGI. These labs assess the stone without any commercial interest in the sale, giving you an honest baseline to compare against price and any claims made by the seller.

Settings and metals that suit the princess cut

The sharp corners of a princess cut are its biggest visual asset and its biggest vulnerability, so the setting you choose has to do more than look good. Prongs need to grip those points firmly, and the metal underneath needs to hold up to daily knocks without softening over time. Get this pairing right and the ring wears as well as it photographs.

Protecting the corners with the right prongs

A four-prong setting placed directly over each corner is the standard choice for a princess cut, since it shields the most fragile part of the stone from impact. Some jewellers add a V-shaped prong at each point for extra security, which is worth asking for if you lead an active lifestyle or work with your hands. A bezel or half-bezel along the edges offers even more protection, though it covers a touch more of the diamond’s profile.

Corner protection isn’t optional on a princess cut, it’s what keeps the stone safe for decades of wear.

Choosing a metal that lasts

Platinum is the most popular choice for princess cut rings because it’s naturally hard-wearing and holds prongs firmly without regular re-tipping. Eighteen-carat white or yellow gold offers a similar look at a lower price, though it needs more frequent prong checks over the years. Rose gold suits vintage-inspired designs and pairs particularly well with a warmer coloured diamond.

• Platinum: strongest prong hold, higher price
• 18ct white gold: classic look, needs periodic re-tipping
• 18ct yellow or rose gold: warmer tone, softer metal

Whichever you choose, ask your jeweller how often they’d recommend checking the setting, since that single habit does more to protect a princess cut than almost anything else.

Princess cut versus other popular diamond shapes

Deciding between a princess cut and another popular shape usually comes down to how much sparkle you want versus how much vintage character or price efficiency matters to you. Each shape handles light, wear, and cost differently, so it helps to see them side by side before you settle on one.

Princess cut vs round brilliant

Round brilliants remain the benchmark for fire and scintillation, since their faceting is engineered purely for maximum light return. However, that extra sparkle comes at a cost, both in price per carat and in the amount of rough diamond wasted during cutting. If you want a modern, angular look without sacrificing much brilliance, the princess cut gives you most of the sparkle for noticeably less money.

Choosing between shapes is really choosing between maximum sparkle and maximum value.

Princess cut vs cushion and emerald cuts

Cushion cuts soften the square outline with rounded corners, trading a little edge definition for a more romantic, vintage feel. Emerald cuts go the other direction entirely, prioritising clarity and elegant lines over brilliance, so inclusions show up more readily. Yet neither offers the same combination of sharp geometry and round-brilliant fire that a princess cut provides.

| Shape | Sparkle level | Style | Relative price |
|—|—|—|
| Round brilliant | Highest | Classic | Highest |
| Princess | High | Modern, angular | Mid |
| Cushion | Medium-high | Soft, vintage | Mid |
| Emerald | Lower | Elegant, understated | Mid-low |

Choosing with confidence

A princess cut natural diamond engagement ring rewards buyers who look past the sparkle and check the fundamentals: cut grade, ratio, prong protection, and independent certification. Get those right and you end up with a ring that looks sharp on the hand and holds up to decades of wear, not just the first year of photos.

Nothing replaces seeing the stone in person before you decide. Handle a few princess cuts side by side, ask about prong maintenance, and compare certificates rather than sales pitches. That’s how you separate a genuinely well-cut diamond from one that only looks good under shop lighting.

If you’d rather skip the guesswork, speak to people who cut and set these stones every day. Book a consultation with A Star Diamonds and let our goldsmiths and gemologists guide you to a princess cut ring worth wearing for life.