Utility Loft → Diamond Size → Chart by Shape
Diamond Size Chart by Shape
Typical face-up millimeter size for every popular diamond shape across carat weights. Compare how big each shape looks, or convert a specific weight below.
Enter a carat weight above to see the diameter in millimeters.
Face-up size by shape and carat (mm)
| Shape | 0.25 ct | 0.50 ct | 0.75 ct | 1.00 ct | 1.25 ct | 1.50 ct | 2.00 ct | 3.00 ct |
|---|---|---|---|---|---|---|---|---|
| Round | 4.1 | 5.2 | 5.9 | 6.5 | 7.0 | 7.4 | 8.2 | 9.4 |
| Princess | 3.5 | 4.4 | 5.0 | 5.5 | 5.9 | 6.3 | 6.9 | 7.9 |
| Cushion | 3.5 | 4.4 | 5.1 | 5.6 | 6.0 | 6.4 | 7.1 | 8.1 |
| Oval | 4.7×3.5 | 6.0×4.4 | 6.8×5.0 | 7.5×5.5 | 8.1×5.9 | 8.6×6.3 | 9.4×6.9 | 10.8×7.9 |
| Emerald | 4.3×3.1 | 5.4×4.0 | 6.2×4.5 | 6.8×5.0 | 7.3×5.4 | 7.8×5.7 | 8.6×6.3 | 9.8×7.2 |
| Pear | 5.2×3.5 | 6.5×4.4 | 7.5×5.0 | 8.2×5.5 | 8.8×5.9 | 9.4×6.3 | 10.3×6.9 | 11.8×7.9 |
| Marquise | 6.3×3.1 | 7.9×4.0 | 9.1×4.5 | 10.0×5.0 | 10.8×5.4 | 11.4×5.7 | 12.6×6.3 | 14.4×7.2 |
Round/princess/cushion shown as one dimension (symmetrical); elongated shapes as length×width. Typical well-cut sizes — verify on the grading report.
Related
Frequently asked questions
Which diamond shape looks the biggest?
For a given carat weight, elongated shapes look largest face-up — marquise, pear, and oval spread the weight over a longer outline. Round and princess look smaller because more weight sits in depth. That's why an oval often appears a half-carat larger than a round of equal weight.
How do I read the diamond size chart?
Find your shape in the first column and your carat weight across the top. The cell shows the typical face-up size in millimeters — a single number for square/round shapes (they're symmetrical) or length×width for elongated shapes.
Are these diamond sizes exact?
They're typical, well-cut dimensions. Actual millimeters vary with each stone's cut proportions and depth, so use the chart to compare shapes and confirm the exact size on the diamond's grading report.