Cushion Cut Lab Grown Diamonds
A soft, pillow-shaped cut with rounded corners and a romantic glow — the modern heir to the antique old mine cut.
What is a cushion cut diamond?
The cushion is a square-to-slightly-rectangular cut with soft, rounded corners and a pillow-like outline. A modern descendant of the antique old mine cut, it pairs large, light-catching facets with a warm, romantic glow — vintage character with contemporary brilliance.
Crushed ice vs. chunky
Cushions come in two sparkle styles. Crushed-ice cushions scatter light into a shimmering, glittery look; chunky cushions show larger, bolder flashes. Neither is better — browse a few to find the sparkle you love.
Square or elongated
A classic cushion is close to square (ratio around 1.00–1.10). Prefer a longer, finger-lengthening look? See our elongated cushion collection. Both share the same soft corners and glow.
What to look for in a cushion
- Sparkle style — decide between crushed-ice shimmer and chunky flashes.
- Ratio — around 1.00–1.10 for a classic square cushion.
- Even corners — the four rounded corners should match.
Use the filters above to set carat, colour, and clarity.
Why buy a cushion from Stienhardt
Every Stienhardt cushion is independently certified by IGI or GIA, graded for the full 4Cs, and conflict-free — all backed by free 30-day returns.
Ready for a setting? Explore our Cushion engagement rings.
Cushion Cut Lab Grown Diamonds — frequently asked questions
What is a cushion cut diamond?
A square-to-slightly-rectangular cut with soft rounded corners and a pillow-like shape — a modern descendant of the antique old mine cut, with a warm, romantic glow.
What's the difference between crushed-ice and chunky cushions?
Crushed-ice cushions scatter light into a glittery shimmer; chunky cushions show larger, bolder flashes. It comes down to which sparkle you prefer.
What's the difference between a cushion and a princess cut?
Both are roughly square, but the cushion has soft, rounded corners and a vintage glow, while the princess has sharp corners and bold modern sparkle.
Should I choose a square or elongated cushion?
A classic cushion is close to square (around 1.00–1.10); an elongated cushion is stretched longer to flatter the finger. See our elongated cushion collection for the longer look.
How is a cushion related to the old mine cut?
The cushion evolved from the antique old mine cut, keeping its soft pillow shape but with modern faceting for more brilliance.
Are cushion cut lab grown diamonds real diamonds?
Yes — they're real diamonds, chemically and optically identical to mined stones, and recognized as diamonds by the FTC.
Are cushion cut lab grown diamonds certified?
Yes. Every Stienhardt cushion is independently certified by IGI or GIA and graded for the full 4Cs.
What setting suits a cushion cut?
Halos, vintage-inspired, and solitaire settings all complement its soft, pillowy shape.
Can I set a cushion into an engagement ring?
Absolutely. Choose your loose stone, then pick a setting and we'll mount it for you.
What is your return policy?
Free 30-day returns on diamonds and jewelry.