What is a princess cut diamond
The princess cut was developed in the 1960s and 1970s, with different cutters contributing to its evolution. The shape as it is known today, a square brilliant with a distinctive V-shaped chevron pattern visible on the pavilion facets, was refined and popularised through the 1980s. By the 1990s, it had become the second most purchased diamond shape in the United States and other major markets.
The name "princess cut" is a trade name, not a technical gemological term. GIA describes the shape on certificates as a "square modified brilliant" or "rectangular modified brilliant." The princess cut name stuck because it is memorable and marketable, but it can cause confusion when buyers encounter the technical terminology on certificates.
The shape's appeal is straightforward: it provides brilliant-cut light performance in a square outline, at a lower price per carat than a round brilliant of equivalent quality. The square shape suits buyers who want a geometric, modern look rather than the traditional round solitaire. It photographs well, works in many setting styles, and is available in wide range of sizes from melee through large solitaire stones.
A square or near-square diamond with sharp 90-degree corners and a modified brilliant-cut facet arrangement. GIA designation: "square modified brilliant" (or "rectangular modified brilliant" for elongated versions). Typically 57–76 facets depending on the number of chevron rows on the pavilion (2-row, 3-row, or 4-row variants exist). No standardised GIA cut grade. Key evaluation parameters: depth percentage, table percentage, length-to-width ratio, corner protection in setting.
The geometry: chevrons and brilliance
The princess cut's internal structure is different from both the round brilliant and the step cuts. Looking at a princess cut face-down (pavilion up), the defining feature is a pattern of V-shaped chevrons radiating from the culet outward. These chevron-shaped facets are arranged in 2, 3, or 4 rows, depending on the cutter's design.
A 2-chevron princess cut has fewer, larger pavilion facets. This produces broader, more defined light flashes when the stone moves. It has a visual character somewhat similar to a classic cushion. A 4-chevron princess cut has more, smaller pavilion facets, producing a denser, more fragmented sparkle pattern similar to a crushed-ice effect. A 3-chevron cut falls between the two.
GIA certificates do not specify the chevron count. Buyers who have a preference between the broad-flash and dense-sparkle versions need to examine the stone or ask the seller specifically. The chevron pattern is visible when the stone is viewed from below or through a loupe.
The crown of a princess cut is relatively low and flat compared to a round brilliant. The table is typically large (67–75%). This combination produces excellent brilliance from below, the large table allows plenty of light entry and exit, but the flat crown means less fire (coloured light dispersion) than a round brilliant with a higher crown angle. The princess cut trades some fire for a cleaner, more geometric profile.
Left: princess cut face-up view. The four sharp 90-degree corners (circled in orange) are the stone's most vulnerable points. Right: pavilion (underside) view showing the characteristic V-shaped chevron pattern. The chevron rows determine the sparkle character of the stone.
Corner chip risk: the critical buyer's knowledge
This is the most important section in this guide, and the one most frequently omitted by sellers. The four sharp 90-degree corners of a princess cut diamond are the shape's defining visual feature and its primary structural vulnerability.
Diamond is the hardest natural material on earth by scratch resistance, scoring 10 on the Mohs scale. But hardness and toughness are different properties. Diamond is hard but not particularly tough: it can cleave along crystal planes and fracture under sharp impact. The corners of a princess cut are thin, pointed, and precisely the kind of geometry where impact force concentrates. A knock against a countertop, a doorframe, or another piece of jewellery can chip a corner.
The chip does not require a dramatic accident. A moderate knock at the wrong angle is sufficient. The risk is cumulative: a ring worn every day accumulates thousands of potential impact events over years. A corner that survives five years may chip in year six. A corner that is exposed, not protected by a prong or setting element, is always at risk.
The probability of chipping is directly determined by the setting. A princess cut with prongs at all four corners, where each prong cradles the corner point of the stone, has its most vulnerable points protected by metal. A princess cut with prongs positioned on the flat sides of the square rather than at the corners has all four corners exposed. The latter is a ring that will chip. How soon depends on the wearer's lifestyle, but the eventual outcome is predictable.
Look at the ring setting from above. The prongs should be positioned at the four corners of the square, each one gripping the corner point of the stone. If the prongs are positioned at the midpoints of the four flat sides instead (which some settings do for aesthetic reasons), the corners are exposed and unprotected. This is not a matter of preference. It is a structural requirement for a princess cut diamond. Reject any setting that leaves the corners exposed.
Ideal proportions for princess cut diamonds
No GIA cut grade exists for princess cuts. These ranges represent industry consensus for well-performing stones.
| Proportion | Recommended range | Why it matters |
|---|---|---|
| Total depth percentage | 64–75% | Princess cuts run deeper than rounds by design. The chevron facet geometry requires more depth to achieve adequate light return. Stones below 64% may window (look glassy and transparent). Above 76% the stone looks notably small for its weight. |
| Table percentage | 62–72% | Princess cuts naturally have large tables. This is expected and not a defect. Very large tables (74%+) reduce fire. The typical 65–70% range gives a good balance of brilliance and fire. |
| Length-to-width ratio | 1.00–1.05 (square); 1.10–1.30 (rectangular) | See section below. A ratio of 1.00–1.05 produces a visually square stone. Above 1.05 and the stone begins to read as rectangular. Ratios above 1.30 are usually considered radiant cuts rather than princess cuts by most dealers. |
| Girdle thickness | Thin to Medium | A consistent girdle thickness around the entire perimeter is important. Very Thin girdles at any point create fragility, especially at corners. Thick girdles add hidden weight. Medium is ideal. |
| Culet | None or Very Small | A visible culet appears as a dark spot at the centre of the stone from above. Princess cuts are most affected by this because the square shape makes the culet area more prominent. |
| Symmetry | Excellent or Very Good | Symmetry in a princess cut means the square is truly square (not slightly rhombus-shaped) and the chevron pattern is even on both sides. Very Good symmetry is acceptable; Excellent is preferred. |
A round brilliant with 63% depth is considered too deep. A princess cut with 68% depth is well within the acceptable range. The difference is facet geometry. The chevron pavilion facets of a princess cut need a certain depth to correctly redirect light upward. Applying round brilliant depth standards to a princess cut will lead to rejecting many perfectly good stones. Always evaluate depth in the context of the specific shape, not by comparing to a round brilliant standard.
Square vs rectangular: the length-to-width ratio
Most princess cuts are intended to be square, with a length-to-width ratio close to 1.00. A ratio of 1.00 to 1.05 is considered square: the difference between these ratios is essentially imperceptible to the naked eye on a stone under 2 carats. A ratio of 1.06 to 1.10 begins to look slightly rectangular and some buyers find this preferable for a more elongated look. Above 1.15, the stone is clearly rectangular and is often classified by dealers as a radiant cut rather than a princess cut, since the radiant cut's cropped corners make more sense for a clearly rectangular square-ish shape.
For buyers who specifically want a perfectly square diamond, the princess cut at 1.00 to 1.03 is the cleanest choice available. The absolute geometric precision of a true square is harder to achieve than it appears: the rough diamond crystal must be oriented and cut carefully to produce a stone where all four sides are exactly equal. Premium is paid for perfectly square princess cuts, which is why slight rectangularity (1.03 to 1.06) is more common in the general market.
For buyers who want a rectangular brilliant, the radiant cut is typically a better choice than a rectangular princess cut. The radiant's cropped corners remove the chip vulnerability at the corners without sacrificing the rectangular outline. A rectangular princess cut has the same corner vulnerability as a square one, now at two corners with acute angles from the rectangle's longer sides, which creates additional fragility.
Colour and clarity for princess cut diamonds
Princess cuts show colour in a pattern that is specific to their geometry. The corners, where facets converge, tend to concentrate colour more than the centre of the stone. A princess cut that looks reasonably colourless in the table area may show a visible tint at the corners. This makes the colour experience slightly uneven across the face of the stone in lower colour grades.
For a consistently colourless appearance in a white gold or platinum setting, G colour is the practical minimum. H colour princess cuts often look acceptable in isolation but show clear warmth when compared to G or better stones. F or G are the safest choices for buyers who want a reliably white-looking stone. For yellow gold settings, I or J colour princess cuts look warm and appropriate, and the corner colour concentration is less noticeable in the warmer metal context.
Clarity in princess cuts behaves differently from both rounds and step cuts. The brilliant-cut pattern does a reasonable job of masking inclusions, but the princess cut has one specific clarity concern: feather inclusions (fracture-like inclusions) near the corners. A feather near a corner, particularly one that reaches toward the surface, creates two problems: it reduces the structural integrity of the corner further, compounding the chip risk, and it may be visible as a reflective line at the corner. Always check the GIA clarity plot for the location of inclusions and specifically note any inclusions near the four corners.
For any princess cut, regardless of the overall clarity grade, check the GIA clarity plot for inclusions at or near the corners. An SI1 stone with all inclusions near the centre may be eye clean and structurally sound. An SI1 stone with a feather reaching toward a corner creates a combined visual and structural concern. VS2 or above ensures the corners are clean in virtually all cases. If buying SI1, always inspect the clarity plot before purchasing.
Setting requirements for princess cut diamonds
The setting is more consequential for a princess cut than for almost any other shape. The combination of sharp corners, corner chipping risk, and the geometric precision of the square outline means that setting choice directly determines both the stone's safety and the ring's visual success.
A four-prong solitaire with prongs at all four corners is the standard and most recommended setting. Each prong grips one corner of the stone, protecting all four vulnerable points. The prongs should be V-shaped or angled to cradle the corner rather than flat-ended prongs that rest on the flat sides. Many purpose-designed princess cut settings use corner prongs as the default; others must be specifically requested. Always confirm prong position before ordering.
A channel setting, where the stone sits between two parallel rails of metal with no individual prongs, is popular for princess cuts in eternity bands and three-stone settings. The channel walls protect the sides of the stone. The corners in a channel setting may or may not be protected depending on the channel design. Full-bezel channel settings protect all edges including corners. Open-channel settings (where the top of the setting is open) may leave the corners slightly exposed. Confirm with the jeweller.
A full bezel setting, where a continuous metal rim surrounds the entire stone, provides the maximum protection for all corners and is the best choice for buyers with very active lifestyles. The trade-off is that the bezel covers some of the stone's sides, making it appear slightly smaller and reducing the light that enters from the sides. A partial bezel (covering two sides) offers moderate protection with less reduction in visible stone area.
Halo settings work well with princess cuts. A square halo following the stone's outline emphasises the geometric precision of the shape. A round halo creates an interesting contrast between the circular outer sparkle and the square inner stone. Both are legitimate design choices. In a halo setting, the prong positions at the inner stone's corners must still be at the corners; the halo does not provide structural protection for the inner stone's corners.
Princess cut vs round brilliant: the honest comparison
| Factor | Princess cut | Round brilliant |
|---|---|---|
| Light return | High. Lower than a GIA Excellent round but meaningfully better than step cuts. Broad, bold sparkle pattern. | Maximum of all shapes. |
| Price per carat | 15–20% less than round for equivalent colour, clarity, and certification. | Highest price due to highest demand. |
| Rough yield | Better than round. A princess cut retains more of the original octahedral rough crystal. This contributes to lower cost and is one reason princess cuts existed before rounds as a cutter's preference. | Round cutting wastes more rough relative to the finished stone weight. |
| Corner chip risk | Significant. Four sharp 90-degree corners must be protected in setting. Active wearers and those who use their hands heavily should consider this carefully. | None. No corners or pointed ends. |
| Setting flexibility | Requires corner-protecting prongs or bezel. Not all settings are appropriate. Setting choice is critical. | Works in virtually any setting design. Most flexible shape for setting selection. |
| Apparent size per carat | Similar to round. A square princess cut of 1.00 carat has similar face-up area to a 1.00 carat round when depth percentages are comparable. | Reference baseline. |
| Colour visibility | Slightly more than round. Corners concentrate colour. G minimum for white look in white metal. | Best at masking colour of all shapes. |
| Aesthetics | Modern, geometric, bold. The square shape has a distinctly contemporary feel. Associated with 1990s and 2000s jewellery design but remaining popular. | Timeless, classical, universally flattering. |
| Resale liquidity | Good. Princess is consistently the second most popular shape, giving reasonable resale liquidity. | Best resale of all shapes. |
Buying a princess cut diamond in India
Princess cut diamonds are widely available in India. Major retail brands including Tanishq, CaratLane, BlueStone, and Malabar Gold all carry princess cut solitaires and three-stone settings. The shape's broad popularity means good selection across size ranges.
When buying a princess cut in India from any retailer, confirm two things before agreeing to any purchase: that the setting has prongs at all four corners (not on the flat sides), and that the certificate is GIA or IGI with verified grades. House lab certificates from retailers' own in-store laboratories should be treated with scepticism for princess cuts above ₹50,000, as the shape's visual boldness can make colour and clarity variations less immediately obvious.
| Carat weight | Approx. princess cut price range | Equivalent round price range | Approx. saving |
|---|---|---|---|
| 0.50 ct | ₹37,000–₹90,000 | ₹45,000–₹1,10,000 | 15–18% |
| 0.70 ct | ₹66,000–₹1,52,000 | ₹80,000–₹1,80,000 | 15–18% |
| 1.00 ct | ₹1,52,000–₹3,75,000 | ₹1,80,000–₹4,50,000 | 15–18% |
| 1.50 ct | ₹3,40,000–₹7,80,000 | ₹4,00,000–₹9,00,000 | 13–17% |
| 2.00 ct | ₹7,80,000–₹18,50,000 | ₹9,00,000–₹22,00,000 | 13–18% |
Prices approximate for mid-2026, natural diamonds, GIA or IGI certified, Excellent or Very Good symmetry, G–H colour, VS2–SI1 clarity. Add GST (1.5%) and setting/making charges. Lab-grown princess cuts are 60–80% less expensive.
1. Certificate: GIA or IGI only. Verify at gia.edu/report-check or igi.org/verify.
2. Setting: confirm prongs are at all four corners, not on the flat sides. Non-negotiable.
3. Clarity plot: check for inclusions near corners. Feathers near corners are a structural risk. Prefer VS2 or above, or inspect SI1 plots carefully.
4. Depth: 64–75%. Do not apply round brilliant depth standards to a princess cut.
5. L/W ratio: 1.00–1.05 for a visually square stone. Check the mm measurements on the certificate.
6. Colour: G minimum for white gold. I acceptable for yellow gold.
7. Girdle: check for Very Thin or Extremely Thin at any point, especially corners.
8. After purchase: have prong security checked every 12–18 months. Corner prongs take more impact than side prongs and should be inspected regularly.
Sources and data integrity note
The princess cut's development history is documented in: Watermeyer, B. (1991). Diamond Cutting. Prestige, Johannesburg. The shape's structural vulnerability at corners and setting requirements are covered in GIA gemological training materials including the GIA Diamond Grading course. Price ranges are approximate estimates for mid-2026 and are not price guarantees.
Frequently asked questions
Is a princess cut the same as a square cut diamond?
In common usage, yes. The terms "princess cut" and "square cut diamond" are used interchangeably by most buyers and retailers. On a GIA certificate, the shape is technically described as "square modified brilliant" rather than "princess cut," since "princess cut" is a trade name. If you see "square modified brilliant" on a certificate, that is the princess cut. The only possible confusion is with other square shapes like the Asscher cut, which GIA describes as "square emerald cut" and is a step-cut shape rather than a brilliant cut.
Why does my princess cut diamond look smaller than my friend's round brilliant of the same carat weight?
Two main reasons. First, princess cuts run considerably deeper than round brilliants (68–72% vs 61–62% for an ideal round), meaning more of the weight is hidden below the girdle in the pavilion rather than spread across the face-up area. A 1.00 carat princess at 70% depth has a smaller face-up footprint than a 1.00 carat round at 61% depth, even though both weigh exactly 1.00 carat. Second, the square outline of the princess may simply look more compact than the circular outline of the round. If face-up size relative to carat weight matters to you, compare the actual mm dimensions listed on each stone's certificate rather than just the carat weight.
Can I put a princess cut diamond in a classic round solitaire setting?
No. A round solitaire setting is designed for a round stone and will not hold a square stone correctly. The prong positions are wrong and the stone will not seat properly. You need a setting specifically designed for a princess cut, with corner prongs sized for the stone's measurements. When purchasing a setting and stone separately, always confirm the setting is designed for princess cut stones, specify the stone's measurements (length, width, depth in mm from the certificate), and have the setting sized and verified by the jeweller before the stone is set.
Is a princess cut good for an active lifestyle?
The honest answer is: with the right setting, yes. With the wrong setting, no. A princess cut in a four-corner-prong setting, where all four sharp corners are gripped by metal, can be worn safely through most everyday activities. The ring should be removed for activities with high impact risk, gym, contact sports, heavy manual work. A full bezel setting provides the best protection for very active wearers. The shape is not inherently incompatible with an active lifestyle, but it does require more setting discipline than a round brilliant, which has no vulnerable corners.
Does a princess cut look good in a halo setting?
Yes, very well. A square halo around a princess cut creates a bold, symmetrical design where the halo echoes and amplifies the square outline of the centre stone. The visual effect is of a dramatically larger centre stone surrounded by matching geometric precision. A round halo around a princess cut creates an interesting contrast, the soft circle against the hard square, which is less conventional but equally effective. In either halo design, confirm that the inner stone's corner prongs are positioned at the corners of the princess cut, not behind or obscured by the halo's inner edge.
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