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Round Cut Diamond Size Chart

With this useful tool, you'll be able to view various diamond shapes and size both in carat weights and mm's.

round diamond sizes on hand

Round

Princess

Pear

Cushion

Oval

Emerald

Radiant

Marquise

Asscher

Heart

Round Diamond Sizes

Shop Round Diamonds
Round MM Size 3.5 mm 3.75 mm 4 mm 4.25 mm 4.5 mm 4.75 mm 5.0 mm 5.25 mm 5.5 mm 5.75 mm 6 mm 6.25 mm 6.5 mm 6.8 mm
Round Carat Weight 0.17 ct 0.21 ct 0.25 ct 0.28 ct 0.36 ct 0.44 ct 0.50 ct 0.56 ct 0.66 ct 0.75 ct 0.84 ct 0.93 ct 1.00 ct 1.25 ct
Round MM Size 7 mm 7.3 mm 7.5 mm 7.75 mm 8 mm 8.25 mm 8.5 mm 8.7 mm 9 mm 9.1 mm 9.5 mm 9.75 mm 10 mm 10.25 mm
Round Carat Weight 1.30 ct 1.50 ct 1.67 ct 1.75 ct 2.00 ct 2.11 ct 2.43 ct 2.50 ct 2.75 ct 3.00 ct 3.35 ct 3.61 ct 3.87 ct 4.16 ct
Round MM Size 10.5 mm 10.75 mm 11 mm 11.25 mm 11.5 mm 12 mm 12.25 mm 12.5 mm 12.75 mm 13 mm 13.5 mm 14 mm 15 mm 16 mm
Round Carat Weight 4.41 ct 4.57 ct 4.91 ct 5.49 ct 5.85 ct 6.84 ct 7.26 ct 7.36 ct 7.52 ct 8.51 ct 9.53 ct 10.49 ct 12.89 ct 16.06 ct

Oval Diamond Sizes

Shop Oval Diamonds
Oval MM Size 3.6x2.7 mm 4x3 mm 4.5x3.5 mm 5x3.5 mm 5.5x3.5 mm 5x4 mm 6x4 mm 6x5 mm 6.5x4.5 mm 7x5 mm 7.7x5.7 mm 8x6 mm 9x6 mm 8.5x6.5 mm
Oval Carat Weight 0.10 ct. 0.15 ct. 0.20 ct. 0.25 ct. 0.33 ct. 0.35 ct. 0.50 ct. 0.61 ct. 0.65 ct. 0.75 ct. 1.00 ct. 1.25 ct. 1.41 ct. 1.50 ct.
Oval MM Size 9x7 mm 10x8 mm 10.5x8.5 mm 12x8 mm 11x9 mm 12x10 mm 14x10 mm 13x11 mm 14x12 mm 15x12 mm 16x12 mm 16x14 mm 18x13 mm 20x15 mm
Oval Carat Weight 2.00 ct. 2.50 ct. 2.88 ct. 3.00 ct. 3.85 ct. 5.05 ct. 5.81 ct. 6.05 ct. 8.21 ct. 8.76 ct. 9.32 ct. 11.88 ct. 12.86 ct. 14.96 ct.

Cushion Diamond Sizes

Shop Cushion Diamonds
Cushion MM Size 4.2 mm 4.9 mm 5.25 mm 5.5 mm 6 mm 6.5 mm 7 mm 7.5 mm 8 mm 8.5 mm
Cushion Carat Weight 0.40 ct. 0.50 ct. 0.75 ct. 1.00 ct. 1.25 ct. 1.50 ct. 2.00 ct. 2.50 ct. 3.00 ct. 3.50 ct.
Cushion MM Size 9 mm 9.5 mm 10 mm 11 mm 12 mm 13 mm
Cushion Carat Weight 4.12 ct. 5.09 ct. 5.62 ct. 7.44 ct. 9.52 ct. 12.66 ct.

Princess Diamond Sizes

Shop Princess Diamonds
Princess MM Size 3.5 mm 3.75 mm 4 mm 4.25 mm 4.5 mm 4.75 mm 5 mm 5.25 mm 5.5 mm 5.75 mm 6 mm 6.25 mm 6.5 mm 6.75 mm
Princess Carat Weight 0.29 ct. 0.31 ct. 0.39 ct. 0.44 ct. 0.50 ct. 0.64 ct. 0.75 ct. 0.90 ct. 1.00 ct. 1.11 ct. 1.25 ct. 1.39 ct. 1.50 ct. 1.75 ct.
Princess MM Size 7 mm 7.25 mm 7.5 mm 7.75 mm 8 mm 8.25 mm 8.5 mm 8.75 mm 9 mm 9.5 mm 9.75 mm 10 mm 10.25 mm 10.5 mm
Princess Carat Weight 2.00 ct. 2.01 ct. 2.50 ct. 2.74 ct. 3.00 ct. 3.24 ct. 3.67 ct. 4.10 ct. 4.12 ct. 5.09 ct. 5.36 ct. 5.62 ct. 5.76 ct. 5.99 ct.
Princess MM Size 11 mm 11.5 mm 12 mm
Princess Carat Weight 7.44 ct. 9.44 ct. 9.52 ct.

Emerald Diamond Sizes

Shop Emerald Diamonds
Emerald MM Size 5x3 mm 5.5x3.5 mm 6x4 mm 6.5x4.5 mm 6.7x4.5 mm 7x5 mm 7.3x5.3 mm 7.5x5.5 mm 8x6 mm 8.5x6.5 mm
Emerald Carat Weight 0.29 ct. 0.46 ct. 0.50 ct. 0.75 ct. 0.88 ct. 1.00 ct. 1.25 ct. 1.50 ct. 1.75 ct. 2.00 ct.
Emerald MM Size 9x7 mm 10x7.5 mm 9.5x7.5 mm 10x8 mm 11x9 mm 12x8 mm 12x10 mm 14x8 mm 13x9 mm 14x10 mm
Emerald Carat Weight 2.50 ct. 3.00 ct. 3.21 ct. 3.79 ct. 5.21 ct. 5.34 ct. 6.00 ct. 6.25 ct. 6.38 ct. 8.48 ct.
Emerald MM Size 13x11 mm 14x12 mm 16x12 mm
Emerald Carat Weight 9.13 ct. 11.26 ct. 14.22 ct.

Heart Diamond Sizes

Shop Heart Diamonds
Heart MM Size 4 mm 4.25 mm 4.5 mm 4.75 mm 5 mm 5.5 mm 6 mm 6.25 mm 6.5 mm 7 mm
Heart Carat Weight 0.25 ct. 0.28 ct. 0.34 ct. 0.38 ct. 0.50 ct. 0.61 ct. 0.75 ct. 0.83 ct. 1.00 ct. 1.25 ct.
Heart MM Size 7.5 mm 8 mm 8.5 mm 9 mm 10 mm 11 mm 12 mm 13 mm 14 mm 15 mm
Heart Carat Weight 1.50 ct. 2.00 ct. 2.50 ct. 3.00 ct. 3.50 ct. 4.41 ct. 5.66 ct. 7.88 ct. 9.38 ct. 10.79 ct.
Heart MM Size 16 mm 18 mm
Heart Carat Weight 13.27 ct. 15.33 ct.

Pear Diamond Sizes

Shop Pear Diamonds
Pear MM Size 5x3 mm 5x4 mm 6x4 mm 6.5x4.5 mm 7x5 mm 7.5x5.5 mm 7.7x5.7 mm 8x6 mm 8.5x6.5 mm 10x6 mm 8.7x6.7 mm 9x7 mm 10x8 mm 11x7.50 mm
Pear Carat Weight 0.25 ct. 0.35 ct. 0.50 ct. 0.60 ct. 0.75 ct. 0.85 ct. 1.00 ct. 1.25 ct. 1.50 ct. 1.71 ct. 1.80 ct. 2.00 ct. 2.50 ct. 2.61 ct.
Pear MM Size 11x8 mm 12x8 mm 12x7 mm 13x8 mm 12x9 mm 14x8 mm 13x9 mm 14x9 mm 15x9 mm 14x10 mm 13x11 mm 15x10 mm 16x9 mm 16x10 mm
Pear Carat Weight 2.70 ct. 3.00 ct. 3.12 ct. 3.40 ct. 3.44 ct. 4.00 ct. 4.11 ct. 4.25 ct. 5.06 ct. 5.41 ct. 5.65 ct. 5.75 ct. 5.86 ct. 6.27 ct.
Pear MM Size 17x10 mm 15x11 mm 18x11 mm 16x12 mm 18x12 mm 18x13 mm
Pear Carat Weight 6.46 ct. 7.36 ct. 8.14 ct. 8.99 ct. 9.35 ct. 10.21 ct.

Marquise Diamond Sizes

Shop Marquise Diamonds
Marquise MM Size 5x3 mm 6.5x3 mm 6x3 mm 7x3 mm 7.5x3.5 mm 7x4 mm 8x4 mm 8.75x4.25 mm 9x4.5 mm 9.5x4.7 mm
Marquise Carat Weight 0.20 ct. 0.23 ct. 0.25 ct. 0.30 ct. 0.33 ct. 0.34 ct. 0.50 ct. 0.70 ct. 0.75 ct. 0.85 ct.
Marquise MM Size 10x5 mm 11x5.5 mm 11.5x6 mm 12x6 mm 13x6.5 mm 14x7 mm 15x7 mm 14x8 mm 15x7.5 mm 15x8 mm
Marquise Carat Weight 1.00 ct. 1.25 ct. 1.33 ct. 1.50 ct. 2.00 ct. 2.50 ct. 3.00 ct. 3.00 ct. 3.25 ct. 3.44 ct.
Marquise MM Size 16x8 mm 16.5x8.25 mm 17x8.5 mm 17.5x10 mm 20x8 mm 20x10 mm 20x11 mm
Marquise Carat Weight 3.86 ct. 4.00 ct. 4.88 ct. 5.50 ct. 7.08 ct. 7.94 ct. 9.50 ct.

Asscher Diamond Sizes

Shop Asscher Diamonds
Asscher MM Size 4 mm 4.5 mm 5 mm 5.5 mm 6 mm 6.5 mm 7 mm 7.5 mm 8 mm
Asscher Carat Weight 0.39 ct. 0.50 ct. 0.75 ct. 1.00 ct. 1.25 ct. 1.50 ct. 2.00 ct. 2.50 ct. 3.00 ct.
Asscher MM Size 8.5 mm 9 mm 9.5 mm 10 mm 11 mm 12 mm 13 mm
Asscher Carat Weight 3.50 ct. 4.12 ct. 5.09 ct. 5.62 ct. 7.44 ct. 9.52 ct. 12.66 ct.

Radiant Diamond Sizes

Shop Radiant Diamonds
Radiant MM Size 5x3 mm 4.5x3.5 mm 6x3 mm 6x4 mm 6.5x4.5 mm 7x5 mm 7.3x5.5 mm 7.5x5.8 mm 8x6 mm 8.5x6.5 mm
Radiant Carat Weight 0.31 ct. 0.34 ct. 0.41 ct. 0.50 ct. 0.75 ct. 1.00 ct. 1.25 ct. 1.50 ct. 2.00 ct. 2.25 ct.
Radiant MM Size 9x7 mm 9.5x7.5 mm 10x7 mm 10x8 mm 11x9 mm 12x9 mm 11.5x10 mm 13x9 mm 12x10 mm 14x10 mm
Radiant Carat Weight 2.50 ct. 3.00 ct. 3.31 ct. 3.50 ct. 5.05 ct. 6.06 ct. 6.45 ct. 6.54 ct. 6.79 ct. 8.47 ct.
Radiant MM Size 13x11 mm 13.5x11.5 mm 15x11 mm 14x12 mm 16x12 mm
Radiant Carat Weight 9.33 ct. 10.19 ct. 11.48 ct. 12.14 ct. 14.22 ct.

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