The shape library
Round brilliant
Balanced. Luminous. Versatile.
Brilliant cut
Round brilliant
Balanced. Luminous. Versatile.
A circular outline and a radial facet arrangement create an even play of light. The round brilliant is a familiar starting point for solitaire settings and matched layouts.
View round brilliant size chart A closer look at round brilliantIllustrative faceted models, shown under consistent lighting. Actual stones, facet patterns and proportions vary.
A sense of scale
Round brilliant
size chart.
All sizes, in two parts. Select any weight below to compare its approximate millimetre size.
Measured across the circular outline, viewed from above.
Understand carat and the 4Cs01 Small stones
0.02–0.20 ct
| Carat weight (ct) | Diameter (mm, approx.) |
|---|---|
| 1.7 | |
| 2 | |
| 2.2 | |
| 2.4 | |
| 2.5 | |
| 2.7 | |
| 2.75 | |
| 2.8 | |
| 3 | |
| 3.2 | |
| 3.4 | |
| 3.7 | |
| 3.8 |
02 Larger stones
0.25–5.00 ct
| Carat weight (ct) | Diameter (mm, approx.) |
|---|---|
| 4.1 | |
| 5.2 | |
| 5.8 | |
| 6.5 | |
| 7.4 | |
| 8.2 | |
| 9.4 | |
| 10.4 | |
| 11.2 |
† Calculated estimate from nearby published sizes. Below the smallest reference, dimensions are scaled assuming unchanged proportions. These entries describe an illustrative size, not a measured stone.
Educational estimates. Carat measures weight: 1 ct = 0.2 g. Depth, girdle and proportions affect dimensions, so there is no exact mm-to-carat conversion. Check the individual stone’s measurements and grading report.
References: Diamond Source of Virginia size chart · Palloys small-diamond chart (PDF, p. 140)GIA carat education
Character & construction
Balanced. Luminous. Versatile.
A circular outline and a radial facet arrangement create an even play of light. The round brilliant is a familiar starting point for solitaire settings and matched layouts.
What to consider
Read cut, polish and symmetry alongside colour and clarity. Compare actual measurements and appearance, not carat weight alone.
Ask for the actual measurements, report and images of the stone being offered. A shape illustration cannot establish its appearance, grading or availability.
Read the shape alongside the 4CsContinue exploring
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