Round Cut Lab Grown Diamonds
The classic brilliant — 57 to 58 facets engineered for maximum sparkle and light return.
What is a round cut diamond?
The round brilliant is the most popular and most sparkly diamond shape — 57 or 58 facets arranged through decades of optical research to maximise brilliance, fire, and light return. If you want the most sparkle and a timeless, never-dated look, the round is the benchmark every other shape is measured against.
Why cut grade matters most for a round
For a round, cut is the single most important of the 4Cs — it's what unlocks all that brilliance. Prioritise an Excellent or Ideal cut grade; a well-cut round in a lower colour or clarity will still out-sparkle a poorly cut one with better grades. Look for strong cut, polish, and symmetry first.
What to look for in a round
- Cut grade — Excellent/Ideal first; it drives the sparkle.
- Colour & clarity — a round's busy faceting hides inclusions and tints well, so eye-clean SI and near-colourless G–H often look superb for the money.
- Symmetry & polish — round out the light performance.
Use the filters above to set your preferences.
Round engagement rings
A round works in every setting ever made — solitaire, halo, pavé, three-stone, hidden halo. It's the most flexible, future-proof choice. Pick your loose stone here, then build it into the ring of your choice.
Ready for a setting? Explore our Round engagement rings.
Why buy a round from Stienhardt
Every Stienhardt round is independently certified by IGI or GIA, graded for the full 4Cs, and conflict-free — all backed by free 30-day returns.
Round Cut Lab Grown Diamonds — frequently asked questions
What is a round cut diamond?
The round brilliant — a 57 or 58 facet cut engineered for maximum brilliance and light return. It's the most popular and most sparkly diamond shape.
Why is cut grade so important for a round?
Cut unlocks the round's sparkle. A well-cut round (Excellent/Ideal) outshines a poorly cut one even with better colour or clarity, so prioritise cut first.
Why are round diamonds more expensive per carat?
Cutting a round wastes more of the original rough crystal than other shapes, so round diamonds cost more per carat — though lab grown makes them far more affordable.
What colour and clarity should I choose for a round?
A round's faceting hides tint and inclusions well, so eye-clean SI clarity and near-colourless G–H often look excellent for the money.
Are round 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 round cut lab grown diamonds certified?
Yes. Every Stienhardt round is independently certified by IGI or GIA and graded for the full 4Cs.
What are hearts and arrows?
A pattern seen in the very best-cut rounds, indicating excellent optical symmetry — a sign of top light performance.
What setting suits a round?
Every setting — solitaire, halo, pavé, three-stone, hidden halo. The round is the most versatile shape.
Can I set a round 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.