1 Carat Lab Grown Diamonds
The classic engagement size — about 6.5mm across in a round, timeless and beautifully wearable.
How big is a 1 carat lab grown diamond?
A 1 carat round measures roughly 6.5mm across — the classic, instantly recognisable engagement size that looks balanced on almost any hand. Elongated shapes like oval and marquise of the same weight look a little larger because they spread their size across a longer face.
How much does a 1 carat lab grown diamond cost?
A lab grown 1 carat costs a fraction of a mined diamond of the same size and quality — which is why it's such a popular choice. The exact price depends on the 4Cs (cut, colour, clarity, and the stone's grades), so the best way to see real numbers is to filter the live collection above by your budget.
Getting the most from 1 carat
- Cut first — a well-cut 1 carat sparkles more than a larger, poorly cut stone.
- Shape — elongated cuts read slightly larger than a round at the same weight.
- Colour & clarity — near-colourless (G–H) and eye-clean (VS–SI) give the best value without a visible difference.
Use the filters above to dial it in.
1 carat engagement rings
A 1 carat centre stone suits every setting — solitaire, halo (which makes it look larger), pavé, and three-stone. Choose your loose stone here, then build it into the ring of your choice.
Why buy a 1 carat from Stienhardt
Every Stienhardt diamond is independently certified by IGI or GIA, graded for the full 4Cs, and conflict-free — all backed by free 30-day returns.
1 Carat Lab Grown Diamonds — frequently asked questions
How big is a 1 carat lab grown diamond?
A 1 carat round is about 6.5mm across — the classic engagement size. Elongated shapes of the same weight can look slightly larger.
How much does a 1 carat lab grown diamond cost?
Far less than a mined 1 carat of the same quality. The price depends on the 4Cs — filter the collection above by budget to see live prices.
Is a 1 carat diamond a good size?
Yes — it's the most classic engagement size, recognisable and wearable, and lab grown makes it very affordable.
Which shape looks biggest at 1 carat?
Elongated shapes — oval, marquise, pear, and emerald — look largest per carat because they spread their weight across a longer face.
Are 1 carat 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 1 carat lab grown diamonds certified?
Yes. Every Stienhardt diamond is independently certified by IGI or GIA and graded for the full 4Cs.
What colour and clarity should I choose for a 1 carat?
Near-colourless (G–H) and eye-clean (VS–SI) give the best value with no visible difference to the eye.
Is 1 ct the same as 1 carat?
Yes — 'ct' is just the abbreviation for carat, the unit of a diamond's weight.
Can I set a 1 carat 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.