The shape library
Trillion
Three sides. A decisive accent.
Triangular cut
Trillion
Three sides. A decisive accent.
A triangular silhouette can act as a centre stone or flank another diamond. Sides may be straight or gently curved and facet patterns vary.
View trillion size chart A closer look at trillionIllustrative faceted models, shown under consistent lighting. Actual stones, facet patterns and proportions vary.
A sense of scale
Trillion
size chart.
All sizes, in two parts. Select any weight below to compare its approximate millimetre size.
This reference lists one nominal millimetre size for a triangular stone, not length × width or depth. Confirm all measurements on the actual stone’s report.
Understand carat and the 4Cs01 Small stones
0.02–0.20 ct
| Carat weight (ct) | Nominal size (mm, approx.) |
|---|---|
| 1.8 † | |
| 2 † | |
| 2.2 † | |
| 2.4 † | |
| 2.5 † | |
| 2.7 † | |
| 2.8 † | |
| 2.9 † | |
| 3 | |
| 3.3 † | |
| 3.5 | |
| 3.7 † | |
| 3.9 † | |
| 4 |
02 Larger stones
0.40–5.50 ct
| Carat weight (ct) | Nominal size (mm, approx.) |
|---|---|
| 5 | |
| 6 | |
| 6.5 | |
| 7.5 | |
| 8 | |
| 9 | |
| 10 | |
| 11 |
† 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: Thomas Laine size chartGIA carat education
Character & construction
Three sides. A decisive accent.
A triangular silhouette can act as a centre stone or flank another diamond. Sides may be straight or gently curved and facet patterns vary.
What to consider
For pairs, compare outlines and millimetre measurements closely. Protect corners and confirm orientation with the jewellery designer.
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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