Elongated Cushion Cut Diamond Buying Guide
One of 2026's defining engagement ring shapes — the ratio to look for, how it compares to oval, and why it often costs less per carat.
Elongated cushion cut diamonds have become one of the defining engagement ring shapes of the current market — a rounded-square outline stretched into a longer, more slender silhouette, often paired with antique-inspired settings.
What makes it "elongated"
A standard cushion cut runs close to square (a length-to-width ratio near 1.00–1.10); the elongated variation stretches that out, typically to somewhere in the 1.15–1.35 range. Ratios closer to 1.15 retain more of the traditional cushion's fuller shape; ratios approaching 1.30–1.35 — the antique-inspired variation currently trending — create a noticeably longer, more dramatic outline.
Elongated cushion vs oval
Both are elongated shapes that tend to face up larger than their carat weight, but the outline reads differently: oval is a continuous curve, elongated cushion keeps the cushion's characteristic rounded corners on a rectangular-ish body. If you like the "looks bigger" effect of an elongated shape but prefer a softer, more structured outline over oval's pure curve, elongated cushion is the natural alternative to compare against. See our general cushion cut page for the shape's broader gemological background.
Value relative to round
Cushion cuts, elongated or not, commonly trade at a real discount to round brilliants of comparable quality — commonly cited in current trade pricing as somewhere in the region of 25–30% less per carat, though this varies by specific stone. Combined with the "looks bigger" visual effect of the elongated variation, this makes elongated cushion one of the stronger value plays among currently fashionable shapes.
What to check before buying
- Ratio — decide deliberately between a fuller (~1.15–1.20) or more dramatically elongated (~1.25–1.35) look.
- Crushed ice vs chunky faceting — cushion cuts vary between a sparkly, fragmented "crushed ice" facet pattern and a bolder "chunky" pattern with larger, more distinct facets; this is a genuine style preference worth seeing in person or on video before committing.
- Corners — check the certificate and photos for corner symmetry; uneven corners are more noticeable on an elongated outline than a square one.
- Certification — see our cert lab guide.
Related reading
- Oval diamond buying guide
- Old Mine Cut diamond buying guide
- Buying a loose diamond for a bespoke engagement ring
Sources: ratio and value guidance consolidated from current trade-jeweller buying guides (Holts Gems, Velur, Christopher Fine Diamonds).
Oval Diamond Buying Guide: Ratio, Bow-Tie & Price
What length-to-width ratio to look for, how to judge the bow-tie effect, and how oval compares on price to round — a practical buying guide.
Emerald Cut Diamond Buying Guide: Clarity, Budget & Ratio
Why emerald cut needs a cleaner clarity grade than brilliant shapes, and why it typically costs meaningfully less per carat than round.
Marquise Diamond Buying Guide: Ratio, Points & Bow-Tie
The ratio most buyers prefer, why the pointed tips need a protective setting, and how to judge the bow-tie effect on a marquise.
Compare real stones before you commit
Use Chaos to understand certificates, pricing, availability and dealer supply before asking for a specific stone.