4Cs.co.za report lens
Diamond shapes explained
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- Stone profile
- Carat
- match
- Colour
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- Clarity
- inspect
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Match the paper to the stone before price, route, or resale.
Diamond shapes explained
The princess cut is a square brilliant-cut diamond with sharp corners and strong light return. Sharp corners are also its main vulnerability.
A princess cut diamond is a square or slightly rectangular modified brilliant with a pavilion faceted to return light efficiently. It is the second most popular cut after the round brilliant. The sharp corners that define its look are also points of chip risk if unprotected by the setting.
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Inspection lens
VerifyReport, inscription, measurements
InspectLight return, tint, inclusions
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Short answer
The princess cut is a square brilliant-cut diamond with sharp corners and strong light return. Sharp corners are also its main vulnerability.
A princess cut diamond is a square or slightly rectangular modified brilliant with a pavilion faceted to return light efficiently. It is the second most popular cut after the round brilliant. The sharp corners that define its look are also points of chip risk if unprotected by the setting.
Use this rule
Do not judge one C alone. Read the certificate, inspect the actual stone, then decide whether beauty, budget, or resale confidence matters most.
How the cut handles light
The princess cut has a modified brilliant facet arrangement on the pavilion that produces a different light pattern from a round brilliant. Rather than the uniform arrow-and-hearts pattern, it shows a distinctive X or chevron pattern. Light return is strong but varies more with cutting quality than in a round brilliant. A poorly cut princess can look dark in the centre.
Corner protection is essential
The four sharp corners are structural weak points. A chip at a corner can render the stone unrestorable in its current form. Setting styles that cover corners, such as four-prong settings positioned at each corner or bezel settings, reduce this risk. A claw positioned at the middle of a side rather than the corner leaves the points exposed.
What to read on a certificate
For princess cuts, the GIA report lists length-to-width ratio, table percentage, depth percentage, and Polish and Symmetry grades. A ratio close to 1.00 gives a square outline. Ratios above 1.05 trend rectangular. Table percentage in the mid-60s to low 70s tends to perform well. Depth percentage around 68-75% is typical.
South African buyers and sellers
Prodiam, in Bedfordview, Johannesburg, handles certified natural diamonds including fancy shapes. For an inspection or valuation of a princess cut diamond, contact sales@prodiam.co.za or +27 11 334 9010.
Decision table
Use the details, not a shortcut.
| Factor | Target range | Risk if outside range |
|---|---|---|
| Length-to-width ratio | 1.00-1.05 for square | Noticeably rectangular outline |
| Table percentage | 65-75% | Too shallow or too dark |
| Depth percentage | 68-75% | Stone hides weight or looks small |
| Polish | Very Good or Excellent | Reduced surface brightness |
| Symmetry | Very Good or Excellent | Uneven facet pattern |
| Corner setting | Prong at corner or bezel | Chip risk at exposed point |
Direct answers
Common questions
Is a princess cut the same as a square cut?
Princess cut is a specific modified brilliant design. Other square cuts include the Asscher and the cushion square. Each has a different facet structure and visual character.
Do princess cuts show colour more than round brilliants?
Yes. The corners of a princess cut can concentrate colour, making tint more visible than in a round brilliant of the same grade. Buyers sensitive to colour may want to go one grade higher than they would for a round.
Can a princess cut diamond be re-cut?
In most cases, re-cutting is not practical. The square outline requires a specific facet arrangement, and cutting away the corners to remove a chip typically means re-cutting to a round or smaller fancy shape.
What metal suits a princess cut ring?
White gold and platinum suit the geometric, sharp aesthetic. Yellow gold works well for warmer-toned stones. The corner protection offered by the setting style matters more than metal colour.
Is a princess cut a good investment?
Fancy shapes including princess cuts generally have thinner secondary markets than round brilliants. If resale is a priority, a certified round brilliant in a recognised grade tends to trade more easily.
When to involve a specialist
If there is a real diamond, the next step is a certificate-led conversation.
Bring the grading report, photos, invoices, valuations, and any estate paperwork. The goal is to move from generic advice to a stone-specific view.
Sources used