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Diamond Education

Diamond education is essential to understand the characteristics and quality aspects of diamonds. Through our Diamond education page, we aim to demystify these concepts and explain their influence on buying decisions, with the help of informative articles, guides and videos.

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Natural Diamonds

Marvel of Nature, Classic & Spectacular

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Diamond Education

Lab-Grown Diamonds

Created Sustainably, Crafted Impeccably

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The 5Cs Explained

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Fancy Shapes

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Fancy Colors

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Fluorescence

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Certification

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Polish & Symmetry

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Buying Guide

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Size Chart

Diamond Size Chart

Diamond Carat Size Chart

Want to know the actual size of a 1 carat diamond on a hand? Use our diamond carat size chart to understand the millimeter (mm) sizes of each diamond shape.

Understanding Diamond Size Measurements

Round

How to Choose the Right Diamond Size

round

round

princess

princess

asscher

asscher

radiant

radiant

cushion

cushion

emerald

emerald

marquise

marquise

oval

oval

pear

pear

heart

heart

Round Diamond Sizes

  • Round MM SizeRound Carat Weight
  • 0.8 mm.0.0025 ct.
  • 1 mm. 0.005 ct.
  • 1.1 mm.0.0067 ct.
  • 1.2 mm.0.009 ct.
  • 1.25 mm.0.01 ct.
  • 1.3 mm.0.01 ct.
  • 1.5 mm.0.015 ct.
  • 1.75 mm.0.02 ct.
  • 1.8 mm.0.025 ct.
  • 2 mm.0.03 ct.
  • 2.2 mm.0.04 ct.
  • 2.5 mm.0.06 ct.
  • 2.75 mm.0.08 ct.
  • 3 mm.0.10 ct.
  • 3.25 mm.0.14 ct.
  • 3.5 mm. 0.17 ct.
  • 3.75 mm.0.21 ct.
  • 4 mm.0.25 ct.
  • 4.25 mm.0.28 ct.
  • 4.5 mm.0.36 ct.
  • 4.75 mm.0.44 ct.
  • 5.0 mm.0.50 ct.
  • 5.25 mm.0.56 ct.
  • 5.5 mm.0.66 ct.
  • 5.75 mm.0.75 ct.
  • 6 mm.0.84 ct.
  • 6.25 mm.0.93 ct.
  • 6.5 mm.1.00 ct.
  • 6.8 mm.1.25 ct.
  • Round MM SizeRound Carat Weight
  • 7 mm.1.30 ct.
  • 7.3 mm.1.50 ct.
  • 7.5 mm.1.67 ct.
  • 7.75 mm.1.75 ct.
  • 8 mm.2.00 ct.
  • 8.25 mm.2.11 ct.
  • 8.5 mm.2.43 ct.
  • 8.7 mm.2.50 ct.
  • 9 mm.2.75 ct.
  • 9.1 mm.3.00 ct.
  • 9.5 mm.3.35 ct.
  • 9.75 mm.3.61 ct.
  • 10 mm.3.87 ct.
  • 10.25 mm.4.16 ct.
  • 10.5 mm.4.41 ct.
  • 10.75 mm.4.57 ct.
  • 11 mm.4.91 ct.
  • 11.25 mm.5.49 ct.
  • 11.5 mm.5.85 ct.
  • 12 mm. 6.84 ct.
  • 12.25 mm.7.26 ct.
  • 12.5 mm.7.36 ct.
  • 12.75 mm.7.52 ct.
  • 13 mm.8.51 ct.
  • 13.5 mm.9.53 ct.
  • 14 mm.10.49 ct.
  • 15 mm.12.89 ct.
  • 16 mm.16.06 ct.

Princess Diamond Sizes

  • Princess MM SizePrincess Carat Weight
  • 1.5 mm. 0.015 ct.
  • 1.75 mm. 0.03 ct.
  • 2 mm. 0.06 ct.
  • 2.25 mm. 0.08 ct.
  • 2.5 mm. 0.10 ct.
  • 2.75 mm. 0.13 ct.
  • 3 mm. 0.18 ct.
  • 3.25 mm. 0.26 ct.
  • 3.5 mm. 0.29 ct.
  • 3.75 mm. 0.31 ct.
  • 4 mm. 0.39 ct.
  • 4.25 mm. 0.44 ct.
  • 4.5 mm. 0.50 ct.
  • 4.75 mm. 0.64 ct.
  • 5 mm. 0.75 ct.
  • 5.25 mm. 0.90 ct.
  • 5.5 mm. 1.00 ct.
  • 5.75 mm. 1.11 ct.
  • 6 mm. 1.25 ct.
  • Princess MM SizePrincess Carat Weight
  • 6.5 mm. 1.50 ct.
  • 6.75 mm. 1.75 ct.
  • 7 mm. 2.00 ct.
  • 7.25 mm. 2.01 ct.
  • 7.5 mm. 2.50 ct.
  • 7.75 mm. 2.74 ct.
  • 8 mm. 3.00 ct.
  • 8.25 mm. 3.24 ct.
  • 8.5 mm. 3.67 ct.
  • 8.75 mm. 4.10 ct.
  • 9 mm. 4.12 ct.
  • 9.5 mm. 5.09 ct.
  • 9.75 mm. 5.36 ct.
  • 10 mm. 5.62 ct.
  • 10.25 mm. 5.76 ct.
  • 10.5 mm. 5.99 ct.
  • 11 mm. 7.44 ct.
  • 11.5 mm. 9.44 ct.
  • 12 mm. 9.52 ct.

Cushion Diamond Sizes

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

Oval Diamond Sizes

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

Emerald Diamond Sizes

  • Emerald MM Size Emerald Carat Weight
  • 3x2 mm.0.10 ct.
  • 3.5x2 mm.0.12 ct.
  • 4x2 mm.0.15 ct.
  • 4x3 mm.0.20 ct.
  • 5x3 mm.0.29 ct.
  • 5.5x3.5 mm.0.46 ct.
  • 6x4 mm.0.50 ct.
  • 6.5x4.5 mm.0.75 ct.
  • 6.7x4.5 mm.0.88 ct.
  • 7x5 mm.1.00 ct.
  • 7.3x5.3 mm.1.25 ct.
  • 7.5x5.5 mm.1.50 ct.
  • 8x6 mm.1.75 ct.
  • 8.5x6.5 mm.2.00 ct.
  • 9x7 mm.2.50 ct.
  • 10x7.5 mm.3.00 ct.
  • 9.5x7.5 mm.3.21 ct.
  • 10x8 mm.3.79 ct.
  • 11x9 mm.5.21 ct.
  • Emerald MM Size Emerald Carat Weight
  • 12x10 mm.6.00 ct.
  • 14x8 mm.6.25 ct.
  • 13x9 mm.6.38 ct.
  • 14x10 mm.8.48 ct.
  • 13x11 mm.9.13 ct.
  • 14x12 mm.11.26 ct.
  • 16x12 mm.14.22 ct.

Heart Diamond Sizes

  • Heart MM Size Heart Carat Weight
  • 3.5 mm.0.18 ct.
  • 4 mm.0.25 ct.
  • 4.25 mm.0.28 ct.
  • 4.5 mm.0.34 ct.
  • 4.75 mm.0.38 ct.
  • 5 mm.0.50 ct.
  • 5.5 mm.0.61 ct.
  • 6 mm.0.75 ct.
  • 6.25 mm.0.83 ct.
  • 6.5 mm.1.00 ct.
  • 7 mm.1.25 ct.
  • 7.5 mm.1.50 ct.
  • 8 mm.2.00 ct.
  • 8.5 mm.2.50 ct.
  • 9 mm.3.00 ct.
  • 10 mm.3.50 ct.
  • 11 mm.4.41 ct.
  • 12 mm.5.66 ct.
  • 13 mm.7.88 ct.
  • Heart MM Size Heart Carat Weight
  • 14 mm.9.38 ct.
  • 15 mm.10.79 ct.
  • 16 mm.13.27 ct.
  • 18 mm.15.33 ct.

Pear Diamond Sizes

  • Pear MM SizePear Carat Weight
  • 3x2 mm. 0.13 ct.
  • 4x2.5 mm.0.18 ct.
  • 4x3 mm.0.21 ct.
  • 5x3 mm.0.25 ct.
  • 5x4 mm.0.35 ct.
  • 6x4 mm.0.50 ct.
  • 6.5x4.5 mm.0.60 ct.
  • 7x5 mm.0.75 ct.
  • 7.5x5.5 mm.0.85 ct.
  • 7.7x5.7 mm.1.00 ct.
  • 8x6 mm.1.25 ct.
  • 8.5x6.5 mm.1.50 ct.
  • 10x6 mm.1.71 ct.
  • 8.7x6.7 mm.1.80 ct.
  • 9x7 mm.2.00 ct.
  • 10x8 mm.2.50 ct.
  • 11x7.50 mm.2.61 ct.
  • 11x8 mm.2.70 ct.
  • 12x8 mm.3.00 ct.
  • 12x7 mm.3.12 ct.
  • 13x8 mm.3.40 ct.
  • 12x9 mm.3.44 ct.
  • 14x8 mm.4.00 ct.
  • 13x9 mm.4.11 ct.
  • Pear MM SizePear Carat Weight
  • 14x9 mm.4.25 ct.
  • 15x9 mm.5.06 ct.
  • 14x10 mm.5.41 ct.
  • 13x11 mm.5.65 ct.
  • 15x10 mm.5.75 ct.
  • 16x9 mm.5.86 ct.
  • 16x10 mm.6.27 ct.
  • 17x10 mm.6.46 ct.
  • 15x11 mm.7.36 ct.
  • 18x11 mm.8.14 ct.
  • 16x12 mm.8.99 ct.
  • 18x12 mm.9.35 ct.
  • 18x13 mm.10.21 ct.

Marquise Diamond Sizes

  • Marquise MM SizeMarquise Carat Weight
  • 3x1.5 mm.0.025 ct.
  • 3.5x1.75 mm.0.065 ct.
  • 3.5x2 mm.0.07 ct.
  • 4x2 mm.0.10 ct.
  • 3.75x1.75 mm.0.11 ct.
  • 4.25x2.25 mm.0.12 ct.
  • 5x2.5 mm.0.14 ct.
  • 5.5x2.75 mm.0.16 ct.
  • 5.5x3 mm.0.18 ct.
  • 5x3 mm.0.20 ct.
  • 6.5x3 mm.0.23 ct.
  • 6x3 mm.0.25 ct.
  • 7x3 mm.0.30 ct.
  • 7.5x3.5 mm.0.33 ct.
  • 7x4 mm.0.34 ct.
  • 8x4 mm.0.50 ct.
  • 8.75x4.25 mm.0.70 ct.
  • 9x4.5 mm.0.75 ct.
  • 9.5x4.7 mm.0.85 ct.
  • Marquise MM SizeMarquise Carat Weight
  • 10x5 mm.1.00 ct.
  • 11x5.5 mm.1.25 ct.
  • 11.5x6 mm.1.33 ct.
  • 12x6 mm.1.50 ct.
  • 13x6.5 mm.2.00 ct.
  • 14x7 mm.2.50 ct.
  • 15x7 mm.3.00 ct.
  • 14x8 mm.3.00 ct.
  • 15x7.5 mm.3.25 ct.
  • 15x8 mm.3.44 ct.
  • 16x8 mm.3.86 ct.
  • 16.5x8.25 mm.4.00 ct.
  • 17x8.5 mm.4.88 ct.
  • 17.5x10 mm.5.50 ct.
  • 20x8 mm.7.08 ct.
  • 20x10 mm.7.94 ct.
  • 20x11 mm.9.50 ct.

Asscher Diamond Sizes

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

Radiant Diamond Sizes

  • Radiant MM SizeRadiant Carat Weight
  • 5x3 mm.0.31 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.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.
  • 11x9 mm.5.05 ct.
  • 12x9 mm.6.06 ct.
  • 11.5x10 mm.6.45 ct.
  • 13x9 mm.6.54 ct.
  • 12x10 mm.6.79 ct.
  • Radiant MM SizeRadiant Carat Weight
  • 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.

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