Radiant Cut Diamond Size Chart (MM)

The ideal ratio for a Radiant cut diamond produces a slightly rectangular shape. The chart below gives you the weight and millimeter size conversions for the ideal radiant cut diamond.

4.3x3 mm. 0.25 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.
8.2x6.2 mm. 2.00 ct.
9x7 mm. 2.50 ct.
9.5x7.5 mm. 3.00 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.

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Diamond Size FAQs

How is diamond size measured?

Is carat the only factor that affects the size appearance of a diamond?

Does the shape of a diamond influence how big it looks?

Can the setting make a diamond look bigger?

What's the difference between "carat weight" and "total carat weight"?

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Can two diamonds of the same carat weight appear different in size?

Is it better to get a slightly smaller diamond with higher quality or a bigger diamond with lower quality?

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Are there ethical considerations to keep in mind when choosing a diamond size?

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