Cushion Ruby Gemstones

What defines a cushion-cut ruby?

A cushion-cut ruby is shaped with a square or rectangular outline, rounded corners, and a faceting pattern — often large, open facets — that allows colour saturation to read clearly across the stone. The result is a gem that holds its red hue in a way that more tightly brilliant cuts can obscure.

The cushion cut's origins trace back centuries to the 'old mine' cut, one of the earliest standardised diamond shapes, later adapted for coloured stones where the primary aim is depth and richness of colour rather than white-light return. For a ruby, this matters considerably: the cushion's larger facets let the stone's characteristic pigeon-blood or vivid red sit visibly at the surface rather than being fragmented into flashes. Length-to-width ratios typically range from 1.00 to 1.10 for a square cushion ruby, and 1.20 to 1.50 for a more rectangular profile. Both proportions are represented in this collection, allowing selection based on the mount shape intended.

How to assess a cushion ruby's quality

Colour is the foremost quality indicator in a cushion ruby — specifically the balance of hue, tone, and saturation. The most sought-after rubies carry a vivid, slightly bluish-red with medium-dark tone, a combination historically referred to as 'pigeon blood' and associated with Burmese (Mogok) origin.

Beyond colour, the key considerations for a cushion ruby are: natural inclusions (rubies are Type II gemstones, meaning inclusions are expected and do not necessarily reduce value unless they threaten structural integrity); clarity under magnification; cutting symmetry, which affects how evenly colour distributes across the cushion face; and treatments. The majority of commercial rubies are heat-treated to improve colour and clarity — a standard, accepted practice — but unheated rubies of fine colour carry a premium. Each cushion ruby is supplied with a certificate of authenticity, and where grading reports from specialist gemological laboratories are available, these will confirm treatment status, origin, and quality characteristics. When set into one of our rings, the finished piece is hallmarked at the London Assay Office.

What does a cushion ruby cost in the UK?

Cushion ruby pricing is driven primarily by colour quality, origin, treatment status, and carat weight. Even at modest weights — 0.5ct to 1.0ct — a fine-colour, heat-treated cushion ruby represents a meaningful investment; unheated stones of comparable quality carry a substantial additional premium.

Origin significantly influences price: Mozambican rubies now rival Burmese stones in terms of colour intensity and command comparable prices at the top end of the market, while Thai and other origins occupy a broader mid-range. For context, Bridebook's 2026 UK average engagement ring spend of £2,247 gives a useful market reference — a cushion ruby set into a ring at that budget will typically represent a smaller stone with moderate colour, or a larger stone with treated colour. Sourcing loose allows full control over the colour-carat-treatment trade-off before committing to a setting. All cushion rubies in this collection are available loose or set into one of our rings, with complimentary insured UK delivery on every order.

Is a cushion ruby durable enough for everyday wear?

Ruby sits at 9 on the Mohs hardness scale, second only to diamond among gemstones in common use, making a cushion ruby well suited to daily wear including in ring settings exposed to regular contact.

The cushion cut's rounded corners are an asset here: unlike sharp-cornered cuts such as princess or emerald, a cushion ruby has no vulnerable points that risk chipping under impact. The stone's corundum mineral structure is highly resistant to scratching from everyday materials. However, ruby — like all corundum — should be kept away from ultrasonic cleaners if the stone contains significant fractures or has been fracture-filled (a more invasive treatment than standard heat treatment). Warm soapy water and a soft brush is the advised cleaning method. A certificate of authenticity accompanying each cushion ruby will indicate treatment status, allowing the appropriate care routine. When set and worn in a bezel or claw mount, a well-cut cushion ruby will retain its colour and face-up appearance for many years without specialist maintenance.

Which settings suit a cushion ruby?

A cushion ruby's rounded square or rectangular outline suits a range of ring architectures, and the choice of setting directly shapes how the stone's colour reads from above.

A four-claw setting gives maximum light entry and allows the cushion ruby to be viewed with minimal metal interruption — particularly effective for vivid, saturated stones where colour is the selling point. A bezel setting wraps the stone's girdle in metal, offering strong protection for daily wear and framing the ruby in a more contemporary silhouette; this also tends to deepen the perceived colour slightly. Halo settings, where a ring of smaller stones surrounds the cushion ruby, can increase the apparent face-up size of the stone and add contrast; white diamonds in a halo set against a red ruby in a yellow or rose gold band is a historically favoured combination. When sourcing a cushion ruby loose, the intended mount should inform the minimum recommended dimensions — our Hatton Garden workshop produces a silver or wax sample prior to casting, so the fit can be confirmed before the ring is finished.