Emerald cut diamonds have a distinctive rectangular shape with broad step facets that create a wide, elegant spread. Their millimeter dimensions differ significantly from round or oval diamonds at the same carat weight, making a dedicated size chart essential for accurate comparison.
This guide provides approximate millimeter measurements for emerald cut diamonds at common carat weights and explains how the cut affects face-up spread.
An emerald cut diamond carat size chart shows approximate length and width by carat. For example, a 1 carat emerald cut typically measures 6.5 × 4.5 mm with a ratio of 1.40–1.50. Emerald cuts often offer good face-up spread because the rectangular shape distributes weight across a wider area than round diamonds.
Emerald Cut Diamond Carat Size Chart
| Carat | Typical Length × Width | Ratio Range | Visual Effect |
|---|---|---|---|
| 0.50 | 5.0 × 3.5 mm | 1.40–1.50 | Delicate, refined |
| 0.75 | 5.8 × 4.0 mm | 1.40–1.50 | Noticeable, elegant |
| 1.00 | 6.5 × 4.5 mm | 1.40–1.50 | Classic size, good spread |
| 1.25 | 6.9 × 4.9 mm | 1.40–1.50 | Substantial, elongated |
| 1.50 | 7.5 × 5.3 mm | 1.40–1.50 | Bold, impressive spread |
| 2.00 | 8.3 × 5.9 mm | 1.40–1.50 | Statement size |
| 2.50 | 8.9 × 6.3 mm | 1.40–1.50 | Very substantial |
| 3.00 | 9.4 × 6.7 mm | 1.40–1.50 | Maximum presence |
These measurements are approximate and vary by cut quality. Emerald cuts with a shallower depth may face up larger, while deeper cuts may appear smaller at the same carat. Compare emerald vs radiant cut for more context.
How Emerald Cut Spread Compares to Other Shapes
Emerald cuts typically offer better face-up spread than round diamonds at the same carat weight because the elongated rectangular shape covers more finger length. A 1 carat emerald cut (6.5 × 4.5 mm) has a similar visual presence to a 1 carat round (6.5 mm diameter) but with a more elongated, elegant silhouette.
Compared to oval diamonds, emerald cuts tend to be slightly less elongated but offer a broader, more architectural look. The step-cut faceting also creates a different sparkle pattern — broad, mirror-like flashes rather than scattered brilliance. Compare Asscher vs emerald cut.
Quick Reference
For a balanced classic emerald: choose a 1.40–1.50 ratio.
Emerald cuts offer good spread: they often face up larger than rounds of the same carat.
Choose higher clarity: emerald cuts show inclusions clearly. VS2 or higher recommended.
Settings: solitaire, bezel, and three-stone with baguettes complement emerald cuts beautifully.
Common Mistakes
- Choosing an emerald cut by carat alone without checking mm dimensions.
- Ignoring the length-to-width ratio — a squarer emerald looks different from an elongated one.
- Choosing too low clarity — the step-cut facets show inclusions clearly.
- Assuming emerald cuts face up the same as rounds at the same carat.
Myth vs Fact
| Myth | Fact |
|---|---|
| Emerald cuts look smaller than rounds at the same carat. | Emerald cuts often offer good face-up spread and can look larger than rounds. |
| All 1 carat emerald cuts are the same size. | Size varies by ratio, cut depth, and individual proportions. |
| Emerald cuts are less brilliant than other shapes. | Emerald cuts have a different, quieter sparkle — broad flashes instead of scattered brilliance. |
FAQ
How many mm is a 1 carat emerald cut diamond?
A typical 1 carat emerald cut diamond measures approximately 6.5 × 4.5 mm with a ratio of 1.40–1.50.
What is the best ratio for an emerald cut?
The most popular ratio range is 1.40 to 1.50. This creates a classic elongated rectangle that is elegant and balanced.
Does an emerald cut look bigger than a round?
An emerald cut often appears larger than a round of the same carat because the rectangular shape creates more finger coverage.
What carat emerald cut looks like a 1 carat round?
An 0.80 to 0.90 carat emerald cut can appear similar in length to a 1 carat round. Compare mm measurements for accuracy.
Is a 1 carat emerald cut good for an engagement ring?
Yes, emerald cuts are a classic choice for engagement rings, offering a clean, elegant look with a distinctive sparkle.
Final Buying Note
An emerald cut diamond carat size chart is a useful starting point, but each emerald cut diamond is unique. Check the actual millimeter dimensions, choose a ratio that flatters your finger, and prioritize clarity since the step-cut facets reveal inclusions clearly. With the right proportions, an emerald cut diamond offers an elegant spread that rivals any other shape.
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