The shape library
Radiant
An architectural outline, alive with light.
Modified brilliant
Radiant
An architectural outline, alive with light.
Clipped corners frame a square or rectangular outline with brilliant-style faceting. Radiants offer a more fragmented light pattern than step cuts.
View radiant size chart A closer look at radiantIllustrative faceted models, shown under consistent lighting. Actual stones, facet patterns and proportions vary.
A sense of scale
Radiant
size chart.
All sizes, in two parts. Select any weight below to compare its approximate millimetre size.
Rectangular examples. Square and more elongated radiants have different dimensions at the same weight.
Understand carat and the 4Cs01 Small stones
0.02–0.20 ct
| Carat weight (ct) | Length × width (mm, approx.) |
|---|---|
| 1.7×1.5 † | |
| 1.9×1.7 † | |
| 2.1×1.9 † | |
| 2.3×2 | |
| 2.4×2.1 † | |
| 2.5×2.2 † | |
| 2.6×2.2 † | |
| 2.7×2.3 | |
| 2.9×2.4 † | |
| 3.2×2.6 † | |
| 3.5×2.8 | |
| 3.7×2.9 † | |
| 3.8×3 |
02 Larger stones
0.25–5.00 ct
| Carat weight (ct) | Length × width (mm, approx.) |
|---|---|
| 3.5×3 | |
| 5×4.5 | |
| 5.5×5 | |
| 6×5.5 | |
| 7×6 | |
| 7.5×7 | |
| 8.5×7.5 | |
| 9.5×8.5 | |
| 10×9 |
† 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: Blue Nile size chart (PDF) · Stuller size chart (PDF)GIA carat education
Character & construction
An architectural outline, alive with light.
Clipped corners frame a square or rectangular outline with brilliant-style faceting. Radiants offer a more fragmented light pattern than step cuts.
What to consider
Look for a pleasing distribution of brightness and balanced corners. Facet patterns differ between stones bearing the same shape name.
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
Another perspective.
Request availability
Begin with
a simple brief.
Add the specifications you know, or describe the requirement in your own words. Availability and documentation are confirmed directly by our team.
Start a conversation