Education

The Diamond Size Chart

Actual sizes on screen for round diamonds

Select a shape to update the list

  • round shape diamond
    round
  • oval shape diamond
    oval
  • princess shape diamond
    princess
  • cushion shape diamond
    cushion
  • emerald shape diamond
    emerald
  • radiant shape diamond
    radiant
  • asscher shape diamond
    asscher
  • marquise shape diamond
    marquise
  • heart shape diamond
    heart
  • pear shape diamond
    pear
  • Show list as:
    Calibrate your screen for true-size diagrams - click here!

    0.03 carat

    ⌀ 2 mm

    0.006g

    0.05 carat

    ⌀ 2.4 mm

    0.01g

    0.07 carat

    ⌀ 2.7 mm

    0.014g

    0.10 carat

    ⌀ 3 mm

    0.02g

    0.15 carat

    ⌀ 3.5 mm

    0.03g

    0.20 carat

    ⌀ 3.8 mm

    0.04g

    0.25 carat

    ⌀ 4.1 mm

    0.05g

    0.33 carat

    ⌀ 4.5 mm

    0.066g

    0.40 carat

    ⌀ 4.8 mm

    0.08g

    0.50 carat

    ⌀ 5.2 mm

    0.1g

    0.65 carat

    ⌀ 5.7 mm

    0.13g

    0.75 carat

    ⌀ 5.9 mm

    0.15g

    0.85 carat

    ⌀ 6.2 mm

    0.17g

    1.00 carat

    ⌀ 6.5 mm

    0.2g

    1.25 carat

    ⌀ 7 mm

    0.25g

    1.50 carat

    ⌀ 7.5 mm

    0.3g

    1.75 carat

    ⌀ 7.9 mm

    0.35g

    2.00 carat

    ⌀ 8.2 mm

    0.4g

    2.25 carat

    ⌀ 8.5 mm

    0.45g

    2.50 carat

    ⌀ 8.9 mm

    0.5g

    3.00 carat

    ⌀ 9.4 mm

    0.6g

    4.00 carat

    ⌀ 10.4 mm

    0.8g

    5.00 carat

    ⌀ 11.2 mm

    1g

    6.00 carat

    ⌀ 11.9 mm

    1.2g

    7.00 carat

    ⌀ 12.5 mm

    1.4g

    8.00 carat

    ⌀ 13 mm

    1.6g

    10.00 carat

    ⌀ 14.1 mm

    2g

    15.00 carat

    ⌀ 16.1 mm

    3g

    20.00 carat

    ⌀ 17.7 mm

    4g

    Round Diamond Sizes

    Round Carat Weight Round MM Size Round Grams Weight
    0.03 ct.⌀ 2 mm0.006g
    0.05 ct.⌀ 2.4 mm0.01g
    0.07 ct.⌀ 2.7 mm0.014g
    0.1 ct.⌀ 3 mm0.02g
    0.15 ct.⌀ 3.5 mm0.03g
    0.2 ct.⌀ 3.8 mm0.04g
    0.25 ct.⌀ 4.1 mm0.05g
    0.33 ct.⌀ 4.5 mm0.066g
    0.4 ct.⌀ 4.8 mm0.08g
    0.5 ct.⌀ 5.2 mm0.1g
    0.65 ct.⌀ 5.7 mm0.13g
    0.75 ct.⌀ 5.9 mm0.15g
    0.85 ct.⌀ 6.2 mm0.17g
    1 ct.⌀ 6.5 mm0.2g
    1.25 ct.⌀ 7 mm0.25g
    Round Carat Weight Round MM Size Round Grams Weight
    1.5 ct.⌀ 7.5 mm0.3g
    1.75 ct.⌀ 7.9 mm0.35g
    2 ct.⌀ 8.2 mm0.4g
    2.25 ct.⌀ 8.5 mm0.45g
    2.5 ct.⌀ 8.9 mm0.5g
    3 ct.⌀ 9.4 mm0.6g
    4 ct.⌀ 10.4 mm0.8g
    5 ct.⌀ 11.2 mm1g
    6 ct.⌀ 11.9 mm1.2g
    7 ct.⌀ 12.5 mm1.4g
    8 ct.⌀ 13 mm1.6g
    10 ct.⌀ 14.1 mm2g
    15 ct.⌀ 16.1 mm3g
    20 ct.⌀ 17.7 mm4g

    Oval Diamond Sizes

    Oval Carat Weight Oval MM Size Oval Grams Weight
    0.03 ct.2.4 mm × 1.7 mm0.006g
    0.05 ct.2.9 mm × 2 mm0.01g
    0.07 ct.3.3 mm × 2.3 mm0.014g
    0.1 ct.3.6 mm × 2.5 mm0.02g
    0.15 ct.4.2 mm × 2.9 mm0.03g
    0.2 ct.4.6 mm × 3.2 mm0.04g
    0.25 ct.4.9 mm × 3.4 mm0.05g
    0.33 ct.5.5 mm × 3.8 mm0.066g
    0.4 ct.5.8 mm × 4 mm0.08g
    0.5 ct.6.2 mm × 4.3 mm0.1g
    0.65 ct.6.8 mm × 4.7 mm0.13g
    0.75 ct.7.2 mm × 5 mm0.15g
    0.85 ct.7.5 mm × 5.2 mm0.17g
    1 ct.7.9 mm × 5.5 mm0.2g
    1.25 ct.8.5 mm × 5.9 mm0.25g
    Oval Carat Weight Oval MM Size Oval Grams Weight
    1.5 ct.9.1 mm × 6.3 mm0.3g
    1.75 ct.9.5 mm × 6.6 mm0.35g
    2 ct.9.9 mm × 6.9 mm0.4g
    2.25 ct.10.4 mm × 7.2 mm0.45g
    2.5 ct.10.7 mm × 7.4 mm0.5g
    3 ct.11.4 mm × 7.9 mm0.6g
    4 ct.12.5 mm × 8.7 mm0.8g
    5 ct.13.5 mm × 9.4 mm1g
    6 ct.14.4 mm × 10 mm1.2g
    7 ct.15.1 mm × 10.5 mm1.4g
    8 ct.15.8 mm × 11 mm1.6g
    10 ct.17 mm × 11.8 mm2g
    15 ct.19.4 mm × 13.5 mm3g
    20 ct.21.5 mm × 14.9 mm4g

    Princess Diamond Sizes

    Princess Carat Weight Princess MM Size Princess Grams Weight
    0.03 ct.1.7 mm × 1.7 mm0.006g
    0.05 ct.2.1 mm × 2.1 mm0.01g
    0.07 ct.2.3 mm × 2.3 mm0.014g
    0.1 ct.2.6 mm × 2.6 mm0.02g
    0.15 ct.3 mm × 3 mm0.03g
    0.2 ct.3.3 mm × 3.3 mm0.04g
    0.25 ct.3.5 mm × 3.5 mm0.05g
    0.33 ct.3.9 mm × 3.9 mm0.066g
    0.4 ct.4.1 mm × 4.1 mm0.08g
    0.5 ct.4.4 mm × 4.4 mm0.1g
    0.65 ct.4.8 mm × 4.8 mm0.13g
    0.75 ct.5.1 mm × 5.1 mm0.15g
    0.85 ct.5.3 mm × 5.3 mm0.17g
    1 ct.5.6 mm × 5.6 mm0.2g
    1.25 ct.6 mm × 6 mm0.25g
    Princess Carat Weight Princess MM Size Princess Grams Weight
    1.5 ct.6.4 mm × 6.4 mm0.3g
    1.75 ct.6.7 mm × 6.7 mm0.35g
    2 ct.7 mm × 7 mm0.4g
    2.25 ct.7.3 mm × 7.3 mm0.45g
    2.5 ct.7.6 mm × 7.6 mm0.5g
    3 ct.8.1 mm × 8.1 mm0.6g
    4 ct.8.9 mm × 8.9 mm0.8g
    5 ct.9.6 mm × 9.6 mm1g
    6 ct.10.2 mm × 10.2 mm1.2g
    7 ct.10.7 mm × 10.7 mm1.4g
    8 ct.11.2 mm × 11.2 mm1.6g
    10 ct.12 mm × 12 mm2g
    15 ct.13.8 mm × 13.8 mm3g
    20 ct.15.2 mm × 15.2 mm4g

    Cushion Diamond Sizes

    Cushion Carat Weight Cushion MM Size Cushion Grams Weight
    0.03 ct.1.7 mm × 1.7 mm0.006g
    0.05 ct.2 mm × 2 mm0.01g
    0.07 ct.2.3 mm × 2.3 mm0.014g
    0.1 ct.2.6 mm × 2.6 mm0.02g
    0.15 ct.2.9 mm × 2.9 mm0.03g
    0.2 ct.3.2 mm × 3.2 mm0.04g
    0.25 ct.3.5 mm × 3.5 mm0.05g
    0.33 ct.3.8 mm × 3.8 mm0.066g
    0.4 ct.4.1 mm × 4.1 mm0.08g
    0.5 ct.4.4 mm × 4.4 mm0.1g
    0.65 ct.4.8 mm × 4.8 mm0.13g
    0.75 ct.5 mm × 5 mm0.15g
    0.85 ct.5.3 mm × 5.3 mm0.17g
    1 ct.5.5 mm × 5.5 mm0.2g
    1.25 ct.6 mm × 6 mm0.25g
    Cushion Carat Weight Cushion MM Size Cushion Grams Weight
    1.5 ct.6.3 mm × 6.3 mm0.3g
    1.75 ct.6.7 mm × 6.7 mm0.35g
    2 ct.7 mm × 7 mm0.4g
    2.25 ct.7.3 mm × 7.3 mm0.45g
    2.5 ct.7.5 mm × 7.5 mm0.5g
    3 ct.8 mm × 8 mm0.6g
    4 ct.8.8 mm × 8.8 mm0.8g
    5 ct.9.5 mm × 9.5 mm1g
    6 ct.10.1 mm × 10.1 mm1.2g
    7 ct.10.6 mm × 10.6 mm1.4g
    8 ct.11.1 mm × 11.1 mm1.6g
    10 ct.12 mm × 12 mm2g
    15 ct.13.7 mm × 13.7 mm3g
    20 ct.15.1 mm × 15.1 mm4g

    Emerald Diamond Sizes

    Emerald Carat Weight Emerald MM Size Emerald Grams Weight
    0.03 ct.2.2 mm × 1.5 mm0.006g
    0.05 ct.2.6 mm × 1.8 mm0.01g
    0.07 ct.2.9 mm × 2 mm0.014g
    0.1 ct.3.2 mm × 2.2 mm0.02g
    0.15 ct.3.7 mm × 2.6 mm0.03g
    0.2 ct.4 mm × 2.8 mm0.04g
    0.25 ct.4.3 mm × 3 mm0.05g
    0.33 ct.4.8 mm × 3.3 mm0.066g
    0.4 ct.5.2 mm × 3.6 mm0.08g
    0.5 ct.5.5 mm × 3.8 mm0.1g
    0.65 ct.6 mm × 4.2 mm0.13g
    0.75 ct.6.3 mm × 4.4 mm0.15g
    0.85 ct.6.6 mm × 4.6 mm0.17g
    1 ct.6.9 mm × 4.8 mm0.2g
    1.25 ct.7.5 mm × 5.2 mm0.25g
    Emerald Carat Weight Emerald MM Size Emerald Grams Weight
    1.5 ct.7.9 mm × 5.5 mm0.3g
    1.75 ct.8.4 mm × 5.8 mm0.35g
    2 ct.8.8 mm × 6.1 mm0.4g
    2.25 ct.9.1 mm × 6.3 mm0.45g
    2.5 ct.9.4 mm × 6.5 mm0.5g
    3 ct.10.1 mm × 7 mm0.6g
    4 ct.11.1 mm × 7.7 mm0.8g
    5 ct.11.8 mm × 8.2 mm1g
    6 ct.12.7 mm × 8.8 mm1.2g
    7 ct.13.2 mm × 9.2 mm1.4g
    8 ct.13.8 mm × 9.6 mm1.6g
    10 ct.15 mm × 10.4 mm2g
    15 ct.17.1 mm × 11.9 mm3g
    20 ct.18.9 mm × 13.1 mm4g

    Radiant Diamond Sizes

    Radiant Carat Weight Radiant MM Size Radiant Grams Weight
    0.03 ct.2.1 mm × 1.7 mm0.006g
    0.05 ct.2.5 mm × 2 mm0.01g
    0.07 ct.2.9 mm × 2.3 mm0.014g
    0.1 ct.3.1 mm × 2.5 mm0.02g
    0.15 ct.3.6 mm × 2.9 mm0.03g
    0.2 ct.4 mm × 3.2 mm0.04g
    0.25 ct.4.4 mm × 3.5 mm0.05g
    0.33 ct.4.8 mm × 3.8 mm0.066g
    0.4 ct.5 mm × 4 mm0.08g
    0.5 ct.5.4 mm × 4.3 mm0.1g
    0.65 ct.5.9 mm × 4.7 mm0.13g
    0.75 ct.6.3 mm × 5 mm0.15g
    0.85 ct.6.5 mm × 5.2 mm0.17g
    1 ct.6.9 mm × 5.5 mm0.2g
    1.25 ct.7.4 mm × 5.9 mm0.25g
    Radiant Carat Weight Radiant MM Size Radiant Grams Weight
    1.5 ct.7.9 mm × 6.3 mm0.3g
    1.75 ct.8.3 mm × 6.6 mm0.35g
    2 ct.8.6 mm × 6.9 mm0.4g
    2.25 ct.9 mm × 7.2 mm0.45g
    2.5 ct.9.3 mm × 7.4 mm0.5g
    3 ct.9.9 mm × 7.9 mm0.6g
    4 ct.10.9 mm × 8.7 mm0.8g
    5 ct.11.8 mm × 9.4 mm1g
    6 ct.12.5 mm × 10 mm1.2g
    7 ct.13.1 mm × 10.5 mm1.4g
    8 ct.13.8 mm × 11 mm1.6g
    10 ct.14.8 mm × 11.8 mm2g
    15 ct.16.9 mm × 13.5 mm3g
    20 ct.18.6 mm × 14.9 mm4g

    Asscher Diamond Sizes

    Asscher Carat Weight Asscher MM Size Asscher Grams Weight
    0.03 ct.1.7 mm × 1.7 mm0.006g
    0.05 ct.2 mm × 2 mm0.01g
    0.07 ct.2.3 mm × 2.3 mm0.014g
    0.1 ct.2.6 mm × 2.6 mm0.02g
    0.15 ct.2.9 mm × 2.9 mm0.03g
    0.2 ct.3.2 mm × 3.2 mm0.04g
    0.25 ct.3.5 mm × 3.5 mm0.05g
    0.33 ct.3.8 mm × 3.8 mm0.066g
    0.4 ct.4.1 mm × 4.1 mm0.08g
    0.5 ct.4.4 mm × 4.4 mm0.1g
    0.65 ct.4.8 mm × 4.8 mm0.13g
    0.75 ct.5 mm × 5 mm0.15g
    0.85 ct.5.3 mm × 5.3 mm0.17g
    1 ct.5.5 mm × 5.5 mm0.2g
    1.25 ct.6 mm × 6 mm0.25g
    Asscher Carat Weight Asscher MM Size Asscher Grams Weight
    1.5 ct.6.3 mm × 6.3 mm0.3g
    1.75 ct.6.7 mm × 6.7 mm0.35g
    2 ct.7 mm × 7 mm0.4g
    2.25 ct.7.3 mm × 7.3 mm0.45g
    2.5 ct.7.5 mm × 7.5 mm0.5g
    3 ct.8 mm × 8 mm0.6g
    4 ct.8.8 mm × 8.8 mm0.8g
    5 ct.9.5 mm × 9.5 mm1g
    6 ct.10.1 mm × 10.1 mm1.2g
    7 ct.10.6 mm × 10.6 mm1.4g
    8 ct.11.1 mm × 11.1 mm1.6g
    10 ct.12 mm × 12 mm2g
    15 ct.13.7 mm × 13.7 mm3g
    20 ct.15.1 mm × 15.1 mm4g

    Marquise Diamond Sizes

    Marquise Carat Weight Marquise MM Size Marquise Grams Weight
    0.03 ct.3 mm × 1.5 mm0.006g
    0.05 ct.3.6 mm × 1.8 mm0.01g
    0.07 ct.4 mm × 2 mm0.014g
    0.1 ct.4.6 mm × 2.3 mm0.02g
    0.15 ct.5.2 mm × 2.6 mm0.03g
    0.2 ct.5.8 mm × 2.9 mm0.04g
    0.25 ct.6.2 mm × 3.1 mm0.05g
    0.33 ct.6.8 mm × 3.4 mm0.066g
    0.4 ct.7.4 mm × 3.7 mm0.08g
    0.5 ct.7.8 mm × 3.9 mm0.1g
    0.65 ct.8.6 mm × 4.3 mm0.13g
    0.75 ct.9 mm × 4.5 mm0.15g
    0.85 ct.9.4 mm × 4.7 mm0.17g
    1 ct.10 mm × 5 mm0.2g
    1.25 ct.10.6 mm × 5.3 mm0.25g
    Marquise Carat Weight Marquise MM Size Marquise Grams Weight
    1.5 ct.11.4 mm × 5.7 mm0.3g
    1.75 ct.12 mm × 6 mm0.35g
    2 ct.12.4 mm × 6.2 mm0.4g
    2.25 ct.13 mm × 6.5 mm0.45g
    2.5 ct.13.4 mm × 6.7 mm0.5g
    3 ct.14.2 mm × 7.1 mm0.6g
    4 ct.15.8 mm × 7.9 mm0.8g
    5 ct.17 mm × 8.5 mm1g
    6 ct.18 mm × 9 mm1.2g
    7 ct.19 mm × 9.5 mm1.4g
    8 ct.19.8 mm × 9.9 mm1.6g
    10 ct.21.4 mm × 10.7 mm2g
    15 ct.24.4 mm × 12.2 mm3g
    20 ct.27 mm × 13.5 mm4g

    Heart Diamond Sizes

    Heart Carat Weight Heart MM Size Heart Grams Weight
    0.03 ct.2 mm × 2 mm0.006g
    0.05 ct.2.4 mm × 2.4 mm0.01g
    0.07 ct.2.7 mm × 2.7 mm0.014g
    0.1 ct.3 mm × 3 mm0.02g
    0.15 ct.3.5 mm × 3.5 mm0.03g
    0.2 ct.3.8 mm × 3.8 mm0.04g
    0.25 ct.4.1 mm × 4.1 mm0.05g
    0.33 ct.4.5 mm × 4.5 mm0.066g
    0.4 ct.4.8 mm × 4.8 mm0.08g
    0.5 ct.5.2 mm × 5.2 mm0.1g
    0.65 ct.5.7 mm × 5.7 mm0.13g
    0.75 ct.5.9 mm × 5.9 mm0.15g
    0.85 ct.6.2 mm × 6.2 mm0.17g
    1 ct.6.5 mm × 6.5 mm0.2g
    1.25 ct.7 mm × 7 mm0.25g
    Heart Carat Weight Heart MM Size Heart Grams Weight
    1.5 ct.7.5 mm × 7.5 mm0.3g
    1.75 ct.7.9 mm × 7.9 mm0.35g
    2 ct.8.2 mm × 8.2 mm0.4g
    2.25 ct.8.5 mm × 8.5 mm0.45g
    2.5 ct.8.9 mm × 8.9 mm0.5g
    3 ct.9.4 mm × 9.4 mm0.6g
    4 ct.10.4 mm × 10.4 mm0.8g
    5 ct.11.2 mm × 11.2 mm1g
    6 ct.11.9 mm × 11.9 mm1.2g
    7 ct.12.5 mm × 12.5 mm1.4g
    8 ct.13 mm × 13 mm1.6g
    10 ct.14.1 mm × 14.1 mm2g
    15 ct.16.1 mm × 16.1 mm3g
    20 ct.17.7 mm × 17.7 mm4g

    Pear Diamond Sizes

    Pear Carat Weight Pear MM Size Pear Grams Weight
    0.03 ct.2.6 mm × 1.7 mm0.006g
    0.05 ct.3.2 mm × 2.1 mm0.01g
    0.07 ct.3.5 mm × 2.3 mm0.014g
    0.1 ct.3.9 mm × 2.6 mm0.02g
    0.15 ct.4.5 mm × 3 mm0.03g
    0.2 ct.4.9 mm × 3.3 mm0.04g
    0.25 ct.5.3 mm × 3.5 mm0.05g
    0.33 ct.5.9 mm × 3.9 mm0.066g
    0.4 ct.6.1 mm × 4.1 mm0.08g
    0.5 ct.6.8 mm × 4.5 mm0.1g
    0.65 ct.7.4 mm × 4.9 mm0.13g
    0.75 ct.7.7 mm × 5.1 mm0.15g
    0.85 ct.8 mm × 5.3 mm0.17g
    1 ct.8.4 mm × 5.6 mm0.2g
    1.25 ct.9.1 mm × 6.1 mm0.25g
    Pear Carat Weight Pear MM Size Pear Grams Weight
    1.5 ct.9.6 mm × 6.4 mm0.3g
    1.75 ct.10.2 mm × 6.8 mm0.35g
    2 ct.10.6 mm × 7.1 mm0.4g
    2.25 ct.11.1 mm × 7.4 mm0.45g
    2.5 ct.11.4 mm × 7.6 mm0.5g
    3 ct.12.1 mm × 8.1 mm0.6g
    4 ct.13.4 mm × 8.9 mm0.8g
    5 ct.14.4 mm × 9.6 mm1g
    6 ct.15.3 mm × 10.2 mm1.2g
    7 ct.16.2 mm × 10.8 mm1.4g
    8 ct.16.8 mm × 11.2 mm1.6g
    10 ct.18.2 mm × 12.1 mm2g
    15 ct.20.9 mm × 13.9 mm3g
    20 ct.23 mm × 15.3 mm4g
    measure the size of diamonds ajediam

    Size & Weight of Diamonds

    Standard measurements for popular shapes

    How big is a carat? Welcome to the Size & Weight of Diamonds page—your ultimate guide to understanding diamond sizes and weights! Discover carat sizes and visualize actual diamond sizes on screen, empowering you to make informed decisions when acquiring your diamond.

    Our user-friendly, interactive diamond size charts and advanced diamond size-to-weight converter tool provide seamless estimations based on standard proportions. Keep in mind, estimations may vary for non-standard cuts. For any questions, feel free to contact our team via live chat.