3 Carat Radiant Lab-Grown Diamonds

These are loose radiant lab-grown diamonds from 3.00–3.49 carats. Each stone has its own photos, a grading report from IGI or GIA and, for most, a video, so you can see exactly what you are buying. Prices are live and shown on every stone.

How big is a 3 carat radiant?

Carat is weight, not size, so shape matters. The radiant stones in this range typically measure about 10.3 × 7.2 mm (length × width). A 3 carat round measures about 9.3 mm across; a radiant of the same weight is a rectangle, so it reads longer and slimmer. Compare the millimetre measurements on each listing, not only the carat.

What to look for in a 3 carat radiant

A radiant is a rectangle with cut corners and brilliant-style facets, which makes it livelier than a step cut. The stones here are typically about 1.4 to 1 in length to width. Radiants carry polish and symmetry grades rather than a cut grade; look for Excellent or Very Good on both.

Most stones in this size are D to F in color and VS2 or better in clarity. Use the color and clarity filters to narrow the list.

Next steps

Browse all lab-grown diamonds, read how to compare IGI and GIA reports, or set a stone in a ring with the ring builder. Questions about a stone? Use Ask about this stone on its page and we will reply by email.