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How Much Is A 3 Carat Lab Grown Diamond

What a 3 carat diamond really costs — real, IGI-certified lab-grown stones at a fraction of the mined price, set in solid 18K gold.

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The 3 Carat Edit

A 3 carat lab grown diamond is a real, lab-created diamond weighing three carats — a centrepiece-scale stone grown in a laboratory rather than mined, sized to command the hand.

The Satéur Tout Autour 1874 Diamond Ring™ anchors this edit with a real, IGI-certified lab-grown diamond for a fraction of the mined price — the clearest answer to the question of what a 3 carat stone should cost. Where a mined 3 carat can run deep into five figures, the lab-grown route delivers the same documented carat weight for a sliver of that, complete with complimentary delivery, a lifetime guarantee, and the signature Satéur box. The size stays; the price collapses.

Every ring here is set in solid 18K gold — never plated, never a finish — because a stone this present deserves a band with real weight and a lifetime of wear behind it. The centre diamond is a genuine lab-grown diamond, grown under controlled conditions and graded by IGI to the same scale used for mined material. The certificate is the receipt: documented carat weight, documented quality, no guesswork.

A 3 carat lab-grown diamond is a real diamond, registering 10 on the Mohs scale, so it withstands daily life as readily as any mined stone of the same size. Across this edit the diamonds are graded D–E for colour, Excellent for cut, and VS for clarity — the spec sheet that lets three carats read as bright and clean rather than merely large. At this scale, cut grade does the heavy lifting: Excellent proportions are what turn carat weight into actual brilliance on the hand.

The grid below carries that 3 carat presence across solitaire and pavé settings, round and elongated profiles, and 18K white and yellow gold — so price, metal and silhouette can be weighed side by side rather than in the abstract. Whether you are comparing diamond price per carat, sizing a stone in millimeters, or pricing a full engagement ring, the range is built to make the trade-offs visible. The grid below shows every piece.

Explore related lab-grown diamond styles: [How Much Is A 1 Carat Lab Grown Diamond](/collections/how-much-is-a-1-carat-lab-grown-diamond), [2 Carat Princess Lab Grown Diamond Ring](/collections/2-carat-princess-lab-grown-diamond-ring), [2 Carat Pear Lab Grown Diamond Ring](/collections/2-carat-pear-lab-grown-diamond-ring). For the full range, browse the [Lab Grown Diamonds](/collections/lab-grown-diamonds) collection, and to compare a certified lab diamond against a mined stone read [Lab Grown vs Natural Diamond](/blogs/lab-diamond/lab-grown-vs-natural-diamond).

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Questions

How Much Is A 3 Carat Lab Grown Diamond, answered.

How much does a 3 carat lab grown diamond cost?+

A 3 carat lab-grown diamond costs a fraction of the mined equivalent, which can run well into five figures. Because lab-grown diamonds are produced in controlled conditions rather than extracted, the same documented carat weight and IGI grade is available for a small share of the mined price — the exact figure depends on cut, colour and clarity, all shown per ring in the grid.

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

Both are real diamonds with identical hardness, brilliance and chemistry; the only difference is origin — one is grown in a laboratory, the other extracted from the earth. An IGI certificate documents the same 4Cs for each, which is why a lab-grown 3 carat looks the same on the hand for far less.

How big is a 3 carat diamond in millimeters?+

A round 3 carat diamond measures roughly 9.3 millimeters across, giving it clear centrepiece presence on most hands. Elongated shapes such as oval or emerald can read even larger for the same carat weight because they spread the stone across the finger.

Which cut grade matters most for a 3 carat stone?+

At three carats, cut grade matters most — it is what converts carat weight into actual brilliance. Every Satéur lab diamond is graded Excellent for cut, so the proportions return maximum light and the stone reads as lively rather than simply heavy.

What color and clarity grades are best for a 3 carat lab grown diamond?+

For a stone this size, D–E colour and VS clarity is the considered choice: the diamond stays visibly white and eye-clean without paying for flawless grades no one can see. Every lab diamond in this edit is graded D–E colour and VS clarity for exactly that balance.

Can a 3 carat lab grown diamond be used in an engagement ring?+

Yes — a 3 carat lab-grown diamond makes a striking engagement ring centrepiece, and the styles in this edit are built around exactly that. Each is set in solid 18K gold with an IGI-certified centre stone, arriving with a lifetime guarantee and the signature Satéur box.

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