From the Maison

3 Carat Round Lab Grown Diamond Ring

Real, IGI-certified three-carat round lab-grown diamonds in solid 18K gold — a statement stone, for a fraction of the mined price.

5 PiecesFrom $1,998Free Worldwide Delivery

The 3 Carat Round Edit

A 3 carat round lab grown diamond ring is an engagement ring set with a three-carat, round brilliant diamond created in a laboratory rather than mined from the earth.

The Satéur Tout Autour 1874 Diamond Ring™ anchors our 3 carat round collection: a real, IGI-certified lab-grown diamond for a fraction of the mined price, set in solid 18K gold, delivered free and backed by our lifetime guarantee in the signature Satéur box. Three carats is a statement weight — the round brilliant at its most commanding — and a stone of this size is precisely where lab-grown changes everything, putting a presence once reserved for the few within genuine reach.

Every ring is set in solid 18K gold — real 18-karat gold, not a plating or finish — worked by hand to carry the weight and proportion of a three-carat round. Each diamond is IGI-certified, graded by the same independent institute that grades mined stones, so the carat weight, colour and clarity are fully documented. At three carats, that verification matters most, and every grade is on the certificate.

A lab-grown diamond is a real diamond: crystallised carbon, 10 on the Mohs scale, ready to wear every day for a lifetime. At this size the round brilliant's cut quality drives the look, and the stones across this collection grade in the D–E colour range with Excellent cut and VS clarity — near-colourless, precision-faceted for maximum fire, with inclusions the eye cannot find across a large open table.

The range presents the three-carat round in its strongest forms — clean four-prong solitaires that let the stone dominate, halo settings that push the visual size even further, and accent bands that add light without competing. Carat weights center on three carats, in white and yellow 18K gold, with sturdier band proportions chosen to support a stone of real heft. Whether the aim is an uncompromising solitaire or a setting engineered to look enormous, the collection delivers. The grid below shows every piece.

Explore related lab-grown diamond styles: 2 Carat Cushion Lab Grown Diamond Ring, 2 Carat Emerald Lab Grown Diamond Ring, 5 Carat Lab Grown Diamond Ring. For the full range, browse the Lab Grown Diamonds collection, and to compare a certified lab diamond against a mined stone read Lab Grown vs Natural Diamond.

Free Worldwide Delivery

Tracked, insured, signed-for.

Lifetime Satéur Care

We restore. We polish. We replace.

30-Day Returns

Change of mind, accepted.

Leather Packaging

Every piece, gift-ready.

Questions

3 Carat Round Lab Grown Diamond Ring, answered.

What is a 3 carat round lab grown diamond ring?+

It is an engagement ring set with a real, three-carat round brilliant diamond grown in a laboratory rather than mined. It is a genuine diamond — same carbon, same hardness, same IGI grading — created above ground, which is why a three-carat stone of this quality is attainable at a fraction of the mined price.

How large does a 3 carat round lab grown diamond appear?+

Substantial. A three-carat round brilliant measures roughly 9.3mm in diameter and covers a commanding portion of the finger — noticeably larger than a one- or two-carat stone. Because carat is weight, a three-carat lab-grown diamond is exactly the same size as a three-carat mined diamond.

What is the price difference between a 3 carat lab grown and mined diamond?+

It is dramatic at this size. A mined three-carat diamond commands a steep premium because large mined stones are rare, while a lab-grown three-carat of equal IGI-certified quality costs a fraction of that — the larger the stone, the larger the saving, because you pay for the diamond rather than its scarcity.

Does a 3 carat lab grown diamond look as brilliant as a mined diamond?+

Yes — it is a real diamond with identical optical properties, so its fire and brilliance match a mined diamond of the same cut grade. Our three-carat rounds carry an Excellent cut grade, which is what governs sparkle, so the stone returns light beautifully across its large surface.

What cut grade should I choose for a 3 carat round diamond?+

An Excellent cut grade. Cut determines how brilliantly a round diamond returns light, and at three carats any compromise shows clearly across the wide table. Every round in this collection carries an Excellent cut, paired with D–E colour and VS clarity for maximum sparkle and clean appearance.

Are IGI-certified lab grown diamonds a reliable choice for engagement rings?+

Yes. IGI is a leading independent gemological institute that grades both lab-grown and mined diamonds on the same standards. A lab-grown diamond is real diamond at Mohs 10 hardness, fully suited to a lifetime of daily wear, and IGI certification documents exactly what you are buying.

The Satéur Community

Worn by 100,000 across 150 countries.

Real jewelry. Real lives. Real moments — from Paris to Seoul to Los Angeles.

Enough is the rarest thing The New Diamond Standard^® Enough is the rarest thing The New Diamond Standard^® Enough is the rarest thing The New Diamond Standard^®

Featured In

Vogue Harper’s Bazaar Cosmopolitan Esquire Elle Marie Claire

3 Carat Round Lab Grown Diamond Ring

Browse by category.

3 Carat Round Lab Grown Diamond Ring, answered.

Worn by 100,000 across 150 countries.