Princess Natural Diamonds

What is a princess cut natural diamond?

A princess cut natural diamond is a square or slightly rectangular brilliant-cut stone, typically with 57 or 76 facets arranged to maximise light return from a flat-topped crown. It was developed in the 1960s and 1970s as a way to preserve more of the rough octahedral crystal during cutting than a round brilliant allows, which is why princess cuts often offer more carat weight per pound spent compared with round stones of equivalent face-up diameter. The defining feature is the inverted pyramid profile: viewed from the side, the stone tapers toward a pointed culet, which must be protected by a prong set at each corner when mounted. Natural princess diamonds are cut from earth-mined rough, and the growth patterns formed over billions of years can produce subtle inclusions characteristic of natural origin — features that many buyers regard as part of the stone's individual record.

How does a princess natural diamond compare with other shapes?

The princess natural diamond delivers more brilliance than most other square cuts — step-cut alternatives such as the Asscher or square emerald produce broad flashes rather than the scattered scintillation the princess is known for. Against a round brilliant of the same carat weight, a princess will typically measure around 5% smaller in face-up diameter because the pointed corners push mass into the depth, yet the price-per-carat for a princess natural diamond is generally lower than an equivalent round. Length-to-width ratios between 1.00 and 1.05 produce the most balanced square outline; anything above 1.10 reads as noticeably rectangular. On shorter or wider fingers, the square outline of a princess natural diamond can create an elongating visual effect, similar to an oval or cushion, though the geometry remains distinctly angular rather than soft.

What does a princess natural diamond cost in the UK?

Price for a princess natural diamond is driven primarily by carat weight, colour grade, and clarity grade — the same four-C framework applied to every certified natural diamond. For context, Bridebook's US average engagement ring spend of $6,000 covers a finished ring; a loose princess natural diamond of 0.5ct in G/H colour and VS2 clarity will sit within a more modest budget, while a 1.0ct stone in D/E and VVS grades will command a significantly higher figure. Because princess cuts tend to retain more rough than round brilliants, the cost-per-carat is often lower at equivalent grades — making this shape worth considering when a specific carat target matters. Every princess natural diamond listed here carries a GIA, HRD or IGI certificate so the grade is independently verified.

How is a princess natural diamond certified and sourced?

Every princess natural diamond in this collection is certified by GIA, HRD or IGI — three of the most respected independent grading laboratories. The certificate accompanies the stone and documents the exact carat weight, colour grade (D through Z), clarity grade, cut proportions and any fluorescence. Sourcing follows a chain of custody through ethical-mine partner suppliers committed to responsible extraction. Natural diamonds form under extreme heat and pressure deep within the earth's mantle over timescales measured in billions of years — the trace elements and growth characteristics present in each princess natural diamond are fixed at the moment of formation and cannot be replicated. For buyers weighing natural versus lab-grown, both are certified to identical grading standards; the distinction lies in geological origin and long-term resale behaviour rather than optical performance.

What to consider when setting a princess natural diamond into a ring

The pointed corners of a princess natural diamond are the most structurally vulnerable part of the stone, so setting style is a practical consideration, not merely an aesthetic one. A four-claw setting with prongs positioned precisely at each corner offers the strongest mechanical protection and remains the most common choice. A bezel setting that fully encircles the perimeter provides maximum protection but can reduce the stone's face-up visual presence. Channel or flush settings are typically reserved for side stones rather than the princess natural diamond centre stone. When a loose princess natural diamond is set into one of our rings, the full bespoke process applies: CAD design, a silver or wax sample for try-on at our Hatton Garden workshop, casting, setting, finishing, and hallmarking at the London Assay Office — with a lead time of 7–14 business days from order confirmation.