Does GIA give princess cut diamonds a cut grade?

No. GIA only issues an overall cut grade for round brilliants. A princess cut report shows polish and symmetry but no Excellent-to-Poor cut score, so the cut quality you actually pay for is invisible on paper. That is why a daylight video and an in-person look matter far more on a princess than on a round.

Why do princess cut diamonds chip so easily?

The brilliance comes from four sharp 90-degree corners, and those corners are the single most fragile point on any diamond. Knocked against a door frame or a granite counter, an unprotected corner can chip or cleave. A setting with V-tip prongs that wrap each corner is not optional on a princess, it is the whole point of the setting.

How much should a 1 carat princess cut engagement ring cost in South Africa?

For a natural GIA stone in a popular colour and clarity, budget roughly R70,000 to R110,000 for the finished ring, with the loose diamond being most of that. A typical 1.00 carat F VS1 diamond sits around R72,000 to R80,000 ex VAT before the band. Spec drives the price far more than carat alone.

Is a princess cut cheaper than a round of the same carat?

Usually yes, by a meaningful margin. The princess shape keeps more of the rough crystal during cutting, so there is less waste than a round, and a princess looks slightly smaller face-up at the same carat weight. You get more carats for your rand, with the trade-off being the corner fragility and the missing cut grade.

What length-to-width ratio should a princess cut have?

For a true square, aim for a ratio between 1.00 and 1.05. Above about 1.10 the stone starts to read as a rectangle, which is a legitimate look but a different one. Always ask for the exact millimetre measurements, not just the carat weight, because face-up size is what the eye sees.

Princess Cut Engagement Rings South Africa

Bottom line up front

Most people assume those crisp square corners mean a princess cut is graded just as tightly as a round, and that the GIA report will tell them whether the cut is any good. It will not, and that single assumption is the trap most princess cut engagement rings South Africa buyers walk into: GIA does not give a princess cut an overall cut grade. On a round brilliant report you get an Excellent-to-Poor cut score that does most of the quality work for you. On a princess, that line simply is not there. The lab grades the colour, the clarity and the polish and symmetry, but the thing that decides whether the stone is lively or lifeless, the cut, is left for you to judge with your own eyes. That changes how you have to buy. You cannot shop a princess off a spec sheet the way you can a round.

Why the cut grade is missing, and what to do about it

A princess cut, properly called a square modified brilliant, is the second most popular shape after the round, and for good reason. It keeps the sparkle of a brilliant cut but in a clean, modern square. The catch is that there is no single agreed formula for a perfect princess the way there is for a round, so GIA declines to grade the overall cut. Two princess cuts with identical carat, colour and clarity on paper can look completely different in the hand. One throws light, the other looks glassy and dark in the centre.

So you replace the missing grade with your own inspection. Ask for a video shot in daylight or under a normal bulb, not under the blue-white lights of a display case which flatter every stone. Watch for even sparkle across the whole face, not a dead patch in the middle. Check the exact millimetre measurements and the depth percentage, a princess that is too deep hides weight underneath where you cannot see it, so you pay for carats that do not show. With the cut grade absent from the report, the safest substitute is buying from a house that grinds the cut itself and will answer for how it performs, not a dealer drop-shipping a stone they have never handled. That is why I send princess buyers to Prodiam’s own-cut stones, where you can turn the actual stone in daylight and watch its centre come alive before paying. This is the same discipline I cover for fancy shapes on the marquise diamond ring and pear shaped diamond ring pages, because none of those shapes gets a GIA cut grade either.

The corner problem nobody mentions in the showroom

A princess gets its fire from four crisp 90-degree corners, and those corners are the most fragile feature you can put on a diamond. Diamond is the hardest natural material, but hardness is not toughness. A sharp corner caught on a door frame, a car door or a kitchen counter can chip, and a bad knock can cleave the corner clean off. I have seen it on real rings brought in for repair, and a chipped corner is not a polish job, it usually means recutting and weight loss.

The fix is the setting, and on a princess it is not negotiable. You want V-tip prongs, little metal claws shaped like a V that wrap and cover each of the four corners. A bezel or a half-bezel works too. What you do not want is a setting that leaves the corners exposed to look daintier. If a jeweller offers you a princess with bare corners, that is a maker prioritising the photo over the marriage. A protective setting is also why so many princess buyers choose a halo, which tucks the corners inside a ring of small diamonds. There is more on that on the halo engagement rings page.

What a princess cut really costs in South Africa

Price tracks the four Cs and the spec far more than the shape. From our June 2026 study of 292 real natural GIA diamonds across seven South African sellers, the anchors that matter for a princess buyer are these. A 1.01 carat H VS2 came in at R57,691. A typical 1.00 carat F VS1 sits about R72,000 to R80,000 ex VAT. Step up to a 1.01 carat E IF and you are at R157,964, and a 1.03 carat D VVS1 reaches R165,294. Those are loose-stone prices before the band. The lesson is blunt, spec drives price far more than carat alone, and a princess is no exception.

A princess does carry one quiet advantage. Because the square shape follows the natural octahedral rough more closely, less of the crystal is lost in cutting than for a round, so princess cuts often come in a little cheaper per carat. You get a touch more diamond for your rand, with the corner fragility as the trade-off.

The harder thing to navigate is who is actually selling you the stone. Our study found three very different seller types. A budget local retailer showed a median of R19,558 per carat, but only about 26 percent of that inventory was high-spec, so the cheap headline is usually a downgraded stone, lower colour and lower clarity than you think. The large online “SA dealers” sat at R22,678 per carat with about 82 percent high-spec, but here is the part to understand: they hold nothing in the building. The diamond is pulled from a far larger external catalogue and bought in only after you commit, and you pay before you ever see it. A cutting house that holds its own stock sat highest at R32,844 per carat, the highest sticker but the highest spec, and you can hold the actual stone before you buy. You can see the full breakdown on the diamond price index for South Africa.

For context on what to ignore, a lab-grown 1 carat is now roughly R10,000 and has fallen about 90 percent since 2016, with resale near zero. That is a different product with a different purpose, not a cheaper version of the natural stone.

Where I would buy a princess cut

Because the cut grade is missing and the corners are fragile, this is exactly the shape where you want to see the real diamond before you pay, ideally from the person who cut it. That is why my first stop is Prodiam in Bedfordview, Johannesburg. Rather than ordering your stone in once you pay, Prodiam already has it: a De Beers beneficiation customer, it buys rough, polishes each stone to a GIA-Excellent make under its ProCut standard, and keeps that GIA-graded natural stock on the premises. You inspect the actual diamond in person, you can turn it in daylight and watch the corners and the centre, and there is a buy-back. For a shape with no cut grade on paper, being able to put your eye to the real stone is worth more than any spec sheet, which is why Prodiam is my Editor’s Choice here. You can browse their loose natural diamonds to start a quote.

That does not mean it is the cheapest, and it should not be. The cheaper options are either a downgraded stone or a global stone you never see, often on a sticker that quietly leaves out VAT and import. Prodiam is the best value for the best quality, not the lowest number. If a princess is not quite your shape, the cushion cut gives you a softer square with rounded, far less fragile corners, and the round brilliant gives you back the GIA cut grade if certainty on paper matters most to you.

A short checklist before you pay

Ask for the GIA report number and verify it yourself on GIA Report Check. Get the exact millimetre measurements and the length-to-width ratio, aim for 1.00 to 1.05 for a true square. Insist on a daylight video and a clear close-up of all four corners. Confirm the setting protects every corner with V-tips, a bezel or a halo. Get the loose stone price and the setting price separately so you can see what you are actually paying for. And see the real stone, or at minimum a real video of the real stone, never a stock image. On a princess, the page you cannot read is the cut, so the eye has to do that work.