Cushion Sapphire Gemstones

What is a cushion sapphire and why is it chosen?

A cushion sapphire is a corundum gemstone cut into a cushion shape — a square or rectangular outline with gently rounded corners and a curved, pillow-like profile. The cut typically features large, open facets that allow light to travel deep into the stone, emphasising colour saturation over surface brilliance, which suits sapphire exceptionally well.

Sapphire registers 9 on the Mohs hardness scale, second only to diamond, making it one of the most durable coloured stones available for everyday wear. The cushion cut has origins in the 19th-century 'old mine' style, and its soft geometry complements the richness of blue sapphire in a way that more angular cuts do not. Where an emerald cut can make pale zones in a sapphire more visible, the cushion's rounded facets scatter light across the stone's body, masking uneven colour distribution and deepening the overall tone. Sapphires in this shape are found across the colour spectrum — from the prized cornflower blues of Sri Lanka to the intense velvety blues of Kashmir origin and the warm teal hues of Australia.

How to choose a cushion sapphire: colour, clarity, and carat

When selecting a cushion sapphire, colour is the primary value driver — saturation, hue, and tone together determine how a stone reads to the eye. For blue sapphires, a medium to medium-dark tone with vivid saturation is widely regarded as the most desirable; very dark stones can appear near-black in lower light, while very pale stones lack the depth the cushion cut is designed to showcase.

Clarity in sapphire is assessed differently from diamonds. Minor inclusions, known as 'silk' — fine rutile needle formations — are expected in natural sapphires and do not always reduce value. In cushion-cut sapphires specifically, the larger facets mean inclusions closer to the surface are more visible, so positioning matters. Carat weight interacts with the cushion's proportions: a well-proportioned cushion sapphire carries its weight efficiently across the table, often appearing larger face-up than an equivalent-weight round stone. Certified cushion sapphires are accompanied by a grading report or certificate of authenticity confirming origin, treatment disclosure, and measurements.

What does a cushion sapphire cost in the UK?

Cushion sapphire pricing is driven by four factors: colour grade (hue, saturation, tone), origin, treatment status, and carat weight. Untreated sapphires — those with no heat enhancement — command a significant premium over heat-treated stones, as natural unenhanced colour is rarer and the status is confirmed on the certificate.

Origin also affects price materially. Cushion sapphires from Kashmir carry the highest premiums due to extreme rarity; Burmese and Ceylon (Sri Lanka) origins sit closely behind. Well-cut cushion sapphires from Australia or East Africa offer strong colour at a more accessible price point. Within the context of ring-making, those considering a sapphire centre stone may find the cushion shape an efficient choice — its outline maximises perceived size per carat, which means a well-selected cushion sapphire can deliver considerable visual presence relative to cost. Bridebook's 2026 UK average engagement ring spend of £2,247 provides useful context for budgeting a sapphire-set ring overall, though the stone itself represents only part of that figure.

How are cushion sapphires certified and sourced?

Every cushion sapphire offered here is sourced through ethical-mine partner suppliers and accompanied by certification confirming its identity, measurements, colour description, and any treatments applied. For natural coloured gemstones, grading reports are issued by specialist gemological laboratories — standard reports include treatment disclosure, which is critical for sapphire given how common heat enhancement is across the trade.

Heat treatment, when disclosed, is not a defect — it is an accepted industry process that stabilises and enhances colour. What matters is that the status is fully declared on the certificate, allowing an informed decision. Cushion sapphires offered without heat treatment are noted explicitly in their certification. When a loose cushion sapphire is set into one of our Hatton Garden-crafted rings, the finished piece is then hallmarked at the London Assay Office. All cushion sapphires are available loose or set, with complimentary insured UK delivery and a 30-day return window, no questions asked, no exclusions.

Pairing and setting a cushion sapphire

The cushion shape's rounded corners make it well-suited to four-claw and eight-claw settings, which secure the stone without obscuring its outline. A four-claw mount placed at the corners allows the full cushion profile to remain visible from above, while an eight-claw arrangement adds security for stones above 1.5ct. Bezel settings are also practical — the continuous metal rim protects the rounded edges and suits those who wear their ring through active daily use.

Cushion sapphires pair well with platinum or white gold, which allow the stone's blue to read without interference from the metal's warmth. Yellow gold, particularly 18ct, creates a warmer contrast that suits teal and parti-coloured sapphires. Halo settings placed around a cushion sapphire can visually extend the stone's width, though the cushion's natural outline already carries well without additional framing. When set as the centre stone of a dress ring, cocktail ring, or as part of a three-stone configuration flanked by diamonds or white sapphires, the cushion sapphire's soft geometry anchors the design without competing with surrounding metalwork.