Cushion Natural Diamonds

What defines a cushion natural diamond?

A cushion natural diamond is characterised by its rounded corners and pillow-like outline, a silhouette that traces its lineage directly to the old mine cut popular in the eighteenth and nineteenth centuries. Unlike the sharp corners of a princess cut or the pointed ends of a marquise, the cushion's soft geometry distributes light in broad, open flashes rather than the needle-fine scintillation of a round brilliant. Natural cushion diamonds are cut from rough that has been extracted from kimberlite or alluvial deposits — the same geological origin as all natural diamonds — meaning the colour and clarity characteristics are entirely determined by the conditions in which the crystal formed over billions of years underground. Two sub-types exist: the 'cushion brilliant', which has extra facets below the girdle for higher brilliance, and the 'cushion modified brilliant', which produces chunkier, more open flashes of light sometimes called a 'crushed ice' pattern. Both are widely available in natural form and offer distinctly different visual characters despite sharing the same outline shape.

How to choose the right cushion natural diamond: cut, colour and clarity

Selecting a cushion natural diamond well requires particular attention to the length-to-width ratio and the cut sub-type, because cushion diamonds are not subject to the same standardised cut grades that round brilliants receive from GIA. A length-to-width ratio of 1.00 to 1.05 produces a near-square cushion; ratios of 1.15 to 1.25 yield a more elongated, rectangular outline that can create the visual impression of a larger stone and may flatter a narrower finger profile. For colour, cushion natural diamonds retain warmth more visibly than round brilliants, so stones in the G-to-I range on the GIA scale often appear near-colourless once set, making them a considered choice for those balancing colour against carat weight. On clarity, the cushion's larger facets and open crown mean inclusions can sit more visibly than in a tightly faceted brilliant, so SI1 or VS2 clarity grades warrant careful review of the grading report before purchase. Every cushion natural diamond here is certified by GIA, HRD or IGI, giving a verified baseline for all four quality characteristics.

What does a cushion natural diamond cost in the UK?

Cushion natural diamonds are generally priced below round brilliants of equivalent carat weight, colour and clarity, because the cutting process retains more of the original rough and the shape commands less of a premium in the market. The precise cost of any individual cushion natural diamond is driven by the interplay of carat weight, colour grade, clarity grade, and which sub-type of cut has been applied — a cushion brilliant with strong light return will typically be priced above a cushion modified brilliant in the same weight range. For context, Bridebook's 2026 UK average engagement ring spend of £2,247 covers the full ring including setting, meaning the loose stone budget will vary considerably depending on how much of that figure is allocated to the mount. Purchasing a cushion natural diamond loose allows the stone budget and the setting budget to be considered separately, which many buyers find gives greater control over the overall specification.

How is a cushion natural diamond certified and sourced?

Every cushion natural diamond in this collection is accompanied by a grading report issued by GIA, HRD or IGI — three of the most widely recognised independent gemological laboratories. The report documents the stone's carat weight, colour grade, clarity grade, and cut characteristics, providing an objective, third-party assessment that does not originate from the seller. Natural cushion diamonds in this collection are sourced through ethical-mine partner suppliers, meaning provenance is tracked from mine to grading laboratory. When a loose cushion natural diamond is subsequently set into one of our rings at our Hatton Garden workshop, the finished ring is hallmarked at the London Assay Office — but the hallmark applies to the metal setting, not to the stone itself. Returns on loose cushion natural diamonds are accepted within 30 days, no questions asked, with no exclusions.

Cushion natural diamond vs cushion lab diamond: which to choose?

The primary distinction between a cushion natural diamond and a cushion lab-grown diamond lies in origin and long-term value trajectory rather than in visual or physical characteristics — both are chemically identical forms of carbon. A cushion natural diamond is a finite, mined stone whose supply is fixed by geology; a cushion lab diamond is produced in a controlled environment and is available in larger sizes per unit of budget. Buyers who place importance on geological provenance, long-term resale considerations, or the significance of a stone formed over billions of years typically favour the natural origin. Those prioritising carat weight or colour and clarity specification within a defined budget often find that a lab-grown cushion offers more stone for the same spend. Both types are certified to the same grading standards by GIA, HRD or IGI, and both are available loose or set into one of our rings.