Round Cut Moissanite Engagement Rings

The round brilliant is the most classic engagement ring shape and returns the most light. Alongside modern round brilliants we cut rounds in antique styles, including old European, Portuguese and rose cuts, set as solitaires, halos, clusters and three stone rings.

Why a Round Stone Sparkles the Most

A round brilliant has 57 or 58 facets arranged in a circle, so light is reflected evenly from every direction. That makes it the brightest shape, and its symmetry means it looks the same whichever way the ring turns.

Modern Brilliant or Antique Cut?

  • Round brilliant: crisp, bright sparkle with many small flashes.
  • Old European cut: a small table, high crown and broad facets that give slower, chunkier flashes, like antique rings.
  • Portuguese cut: extra rows of facets around the stone for an intense, glittering look.
  • Rose cut: a flat base and a domed top of triangular facets, for a soft glow instead of sparkle.

Four Prongs or Six?

Four prongs show more of the stone and give it a slightly squarer look. Six prongs hold it more securely and keep the outline perfectly round. Our round designs include six-prong solitaires, cathedral pave bands, hexagon and floral halos, vintage cluster shoulders and dual halos.

Round Sizes at a Glance

As a rough guide, a 6.5 mm round moissanite matches the face-up size of a 1 carat diamond, 8 mm about 2 carats and 9 mm about 2.7 carats. Each listing gives the exact millimetres, and our stone size guide explains how diamond-equivalent sizes work.

Helpful Guides

Common Questions

Should I choose four prongs or six prongs?

Four prongs show more of the stone and look a little more modern. Six prongs give extra security and keep the outline round. Both hold a round moissanite well for daily wear.

How big is a 2 carat round moissanite?

About 8 mm across. Moissanite is sized by diamond equivalent, so a 2 ct round moissanite matches the face-up size of a 2 ct round diamond. Check each listing for the exact millimetres.

What is the difference between an old European cut and a round brilliant?

An old European cut has a smaller table, a higher crown and broader facets, so it shows bigger, slower flashes of light. A modern round brilliant has a larger table and many small facets for a crisper sparkle.