Diamond Size Chart
Radiant Diamond Size Chart
Radiant cut diamonds have trimmed corners and a brilliant cut style that blends round sparkle with an emerald-like outline.
Average Radiant Diamond Sizes
- 0.50 carat ≈ 5 x 4 mm
- 1.00 carat ≈ 6.5 x 5.5 mm
- 2.00 carat ≈ 8 x 7 mm
Tip: Rectangular radiants often look bigger than square ones of the same carat.
Select a diamond shape.
| MM Size | Carat Weight |
|---|---|
| 4.3x3 mm. | 0.25 ct. |
| 4.5x3.5 mm. | 0.34 ct. |
| 6x3 mm. | 0.41 ct. |
| 6x4 mm. | 0.50 ct. |
| 6.5x4.5 mm. | 0.75 ct. |
| 7x5 mm. | 1.00 ct. |
| 7.3x5.5 mm. | 1.25 ct. |
| 7.5x5.8 mm. | 1.50 ct. |
| 8x6 mm. | 1.75 ct. |
| MM Size | Carat Weight |
|---|---|
| 8.2x6.2 mm. | 2.00 ct. |
| 8.5x6.5 mm. | 2.25 ct. |
| 9x7 mm. | 2.50 ct. |
| 9.5x7.5 mm. | 3.00 ct. |
| 10x7 mm. | 3.31 ct. |
| 10x8 mm. | 3.50 ct. |
| 10.2x8.2 mm. | 4.00 ct. |
| 10.5x8.5 mm. | 4.50 ct. |
| 11x9 mm. | 5.00 ct. |
| MM Size | Carat Weight |
|---|---|
| 11.5x10 mm. | 6.45 ct. |
| 12x9 mm. | 6.06 ct. |
| 13x9 mm. | 6.54 ct. |
| 13.2x9.2 mm. | 6.79 ct. |
| 14x10 mm. | 8.47 ct. |
| 13x11 mm. | 9.33 ct. |
| 13.5x11.5 mm. | 10.19 ct. |
| 15x11 mm. | 11.48 ct. |
| 14x12 mm. | 12.14 ct. |
| 16x12 mm. | 14.22 ct. |
4cs of diamond guide
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Frequently Asked Questions
Why do princess cut diamonds look smaller than round diamonds of the same carat?
Princess cuts carry more weight in their depth rather than width, so their surface area appears slightly smaller compared to round cuts of equal carat.
Are princess cut diamonds durable?
They’re strong but have sharp corners that can chip if not protected. A V-prong or bezel setting helps safeguard the corners from damage.
What’s the ideal length-to-width ratio for a princess cut diamond?
A ratio between 1.00 and 1.05 creates a perfect square shape, while anything beyond that starts to look slightly rectangular.
Do princess cut diamonds hide inclusions well?
They’re decent at masking small inclusions, but because of their sharp facet lines, clarity grades of VS2 or higher are usually recommended.