Select your centre stone

Every stone independently graded and certified.

194 results

1 Carat Round Diamonds

One carat is the number most people arrive with, and the round brilliant is the shape they usually picture. Together they are the single most searched combination in the category — and the most expensive way to buy that weight, because demand concentrates exactly here.

The stones on this page run from 0.90 to 1.09 ct. That range is deliberate. A 0.95 ct round measures about 6.3 mm across, a 1.00 ct about 6.5 mm: the difference is roughly the width of a human hair, invisible on the hand, and it can cut the price by ten percent or more. If your budget is fixed, buying just under the round number is the easiest saving in diamonds.

Spend what you save on cut. In a round brilliant the cut grade governs how much light comes back, and an Excellent cut in colour H outperforms a Good cut in colour E every time. Aim for Excellent cut, colour G to I, clarity VS2 or SI1 — at one carat, SI1 inclusions in a round are almost always invisible without a loupe.

Questions people ask before buying

Are these diamonds certified?

Yes. Every stone is graded by GIA, IGI or HRD, and the report number is shown on the stone's page so you can verify it directly with the laboratory. A stone certified by any other laboratory, or ungraded, cannot be bought here at all.

Does the price include a setting?

No. Loose diamonds and ring settings are priced separately, so you can pair any stone with any setting in a compatible shape. The ring builder shows the two together and the combined total before you order.

What should I prioritise when choosing?

Cut first — it is the only grade you can see across a room. Then clarity down to eye-clean, usually VS2 or SI1. Then colour: G or H reads white in platinum, I or J in yellow gold. Then buy just under a landmark weight, because 0.95 ct looks like 1.00 ct and costs less. The guide to the 4Cs explains the trade-offs in full.

How much is shipping?

Nothing. Every order ships free and fully insured, anywhere in the world, at any order value. Import duties and taxes outside the United States are the recipient's responsibility.

Can I return it?

Yes, within 30 days, unworn and in its original packaging with the certificate. The return leg is arranged and paid by you, and must be insured and tracked.

Is there a warranty?

A lifetime warranty against any manufacturing defect, for as long as you own the piece. Full detail on the FAQ page.

Select your centre stone

1.05ct Round Lab Grown Diamond (Colour E, Clarity SI1, Cut EX, IGI Certified)

0.97ct Round Lab Grown Diamond (Colour E, Clarity VS1, Cut EX, IGI Certified)

0.92ct Round Lab Grown Diamond (Colour D, Clarity VS1, Cut EX, IGI Certified)

1.00ct Round Lab Grown Diamond (Colour D, Clarity SI1, Cut VG, IGI Certified)

1.00ct Round Lab Grown Diamond (Colour F, Clarity SI1, Cut VG, IGI Certified)

1.00ct Round Lab Grown Diamond (Colour D, Clarity SI1, Cut ID, IGI Certified)

1.00ct Round Lab Grown Diamond (Colour D, Clarity SI1, Cut ID, IGI Certified)

1.00ct Round Lab Grown Diamond (Colour D, Clarity SI1, Cut VG, IGI Certified)

0.95ct Round Lab Grown Diamond (Colour E, Clarity VS2, Cut EX, IGI Certified)

0.96ct Round Lab Grown Diamond (Colour D, Clarity VS1, Cut EX, IGI Certified)

0.92ct Round Lab Grown Diamond (Colour D, Clarity VS1, Cut ID, IGI Certified)

0.91ct Round Lab Grown Diamond (Colour F, Clarity VS2, Cut ID, IGI Certified)

0.95ct Round Lab Grown Diamond (Colour D, Clarity VS2, Cut EX, IGI Certified)

0.92ct Round Lab Grown Diamond (Colour E, Clarity VS1, Cut VG, IGI Certified)

0.92ct Round Lab Grown Diamond (Colour D, Clarity VS1, Cut VG, IGI Certified)

1.00ct Round Lab Grown Diamond (Colour E, Clarity SI1, Cut EX, IGI Certified)

0.95ct Round Lab Grown Diamond (Colour E, Clarity VS2, Cut ID, IGI Certified)

1.02ct Round Lab Grown Diamond (Colour E, Clarity SI1, Cut ID, IGI Certified)