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SHAPE CARAT TO MM SIZE CONVERSION CHART
​(ALSO CZ WT TO MM SIZE)

This chart is for purposes of estimating the mm size and/or carat weights for the more popular gemstone shapes.  Actual sizes and weights will vary depending on the individual cut and material of each stone.  As a general rule, Cubic Zirconia will weigh approximately 70% more than its Diamond weight material.

(mm.)

CARAT DIA WT

ROUND

OVAL

OCTAGON

PEAR

MARQUISE

HEART

SQUARE

TRILLIANT

0.010

1.25

0.020

1.50

0.025

1.75

1.5 x 1.5

0.040

2.00

1.75 x 1.75

0.050

2.25

3 x 1.5

2 x 2

0.070

2.50

3.5 x 2.5

2.25 x 2.25

0.080

2.75

4 x 2

2.5 x 2.5

0.110

3.00

3 x 3

2.75 x 2.75

3 x 3

0.150

3.25

4 x 3

5 x 2.5

3 x 3

0.180

3.50

5 x 4

3.5 x 3.5

3.25 x 3.25

0.210

3.75

3.5 x 3.5

0.250

4.00

5 x 3

5 x 3

6 x 3

4 x 4

3.75 x 3.75

4 x 4

0.300

4.25

5 x 3

4 x 4

0.360

4.50

5.5 x 3.5

5.5 x 3

4.5 x 4.5

4.25 x 4.25

4.5 x 4.5

0.400

4.75

5.5 x 3.5

7 x 3.5

4.5 x 4.5

5 x 5

0.500

5.00

6 x 4

6 x 4

5 x 5

4.75 x 4.75

5.5 x 5.5

0.550

5.25

6 x 4

8 x 4

5 x 5

6 x 6

0.750

5.75

7 x 5

6.5 x 4.5

7 x 5

9 x 4.5

6 x 6

5.5 x 5.5

6.5 x 6.5

1.000

6.50

7.5 x 5.5

7 x 5

8 x 5

10 x 5

6.5 x 6.5

6 x 6

7 x 7

1.250

6.75

8 x 6

7.5 x 5.5

9 x 6

6.5 x 6.5

7.5 x 7.5

1.500

7.00

8.5 x 6.5

8 x 6

9.6 x 6.5

11 x 5.5

7 x 7

7 x 7

8 x 8

2.000

8.00

9 x 7

8.5 x 6.5

10 x 7

12 x 6

8 x 8

7.5 x 7.5

8.5 x 8.5

2.500

8.50

9.5 x 7.5

9 x 6.5

11 x 7

13 x 6.5

8.5 x 8.5

8 x 8

9 x 9

3.000

9.00

10 x 8

9 x 7

12 x 8

14 x 7

9 x 9

8.5 x 8.5

10 x 10

3.500

9.50

11 x 9

10 x 8

13 x 8

15 x 7.5

9.5 x 9.5

9 x 9

10.5 x 10.5

4.000

10.00

11.5 x 9.5

11 x 9

14 x 9

16 x 8

10 x 10

9.5 x 9.5

11 x 11

5.000

11.00

12 x 10

12 x 10

15 x 10

18 x 9

11 x 11

10 x 10

11.5 x 11.5

6.000

12.00

13 x 10

16 x 10

19 x 10

12 x 12

10.5 x 10.5

12 x 12

7.000

12.50

14 x 10

13 x 10

17 x 10

8.000

13.00

14 x 12

13.5 x 10.5

17 x 12

20 x 10

11 x 11

12.5 x 12.5

9.000

13.50

14 x 10

18 x 11

21 x 10

13 x 13

10.000

14.00

16 x 12

18 x 13

22 x 11

14 x 14

13 x 13

12.000

15.00

18 x 13

14 x 12

19 x 12

24 x 12

15 x 15

14 x 14

15.000

16.00

16 x 12

23 x 14

24 x 14

15.5 x 15.5

15 x 15

18.000

17.00

20 x 15

24 x 15

25 x 13

16 x 16

16 x 16

20.000

18.00

18 x 13

24 x 16

26 x 13

17 x 17

17 x 17

30.000

20.00

22 x 16

20 x 15

25 x 18

25 x 18

20 x 20

21 x 21

40.000

22.00

23 x 19

22 x 16

27 x 18

21 x 21

22 x 22

60.000

23.00

25 X 18

24 x 17

28 x 19

22 x 22

23 x 23

 

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  • Antique & Vintage
    • Shop By Era
    • Engagement Rings
    • Cocktail Rings
    • Timepieces
    • Gentlemans Accessories
    • Bracelets
    • Earrings
    • Necklaces & Pendants
    • Diamonds
    • From The Vault
    • For The Trade
    • The Archives: A Collection of Sold Items
  • Custom
    • Custom Jewelry
    • Custom Engagement Rings
    • Recreating an Heirloom
    • Family Crest Jewelry
    • Design Process
    • Schedule Consultation
  • Sell To Us
  • Services
    • Appraisal Services >
      • Appraisals
      • SELL TO US
      • Museum Collection Services
    • Schedule Consultation
    • Design Custom Jewelry
    • Recreating an Heirloom
    • Diamond Cutting and Gemstone Repair
    • Jewelry Repair
    • Timepiece Repair
    • Diamond Cutting and Gemstone Repair
    • Find Jewelry For Me
    • Find a Watch For Me
    • Insurance Replacement
    • Host a Trunk Show
    • Layaway Plan
    • Private Collection Management
  • The Brand
    • Our History >
      • Sustainability
      • Military and First Responder Discounts
      • Kimberly Process
    • Our Experts
    • Press
    • Be Social
    • Gems by VBS The BLOG
    • Reviews
    • Advice >
      • The Courtship
      • The Wedding
    • Education >
      • Educational Session
      • Antique & Vintage Education >
        • Ancient
        • Medieval & Renaissance
        • Baroque & Rococo
        • Georgian
        • Victorian
        • Edwardian
        • Art Nouveau
        • Arts & Crafts
        • Art Deco
        • Retro
        • Hollywood Glam
        • Mid-Century Modern
        • Brutalist
        • Art Organique
        • Contemporary
        • Simplistic
      • Diamond Education >
        • Diamond Carat Weight by MM
        • Comparative Round Size Info
      • Gemstone Education >
        • Gemstone Laboratories
        • All About Gemstones
        • Approximate Gemstone weights
        • Carat to MM Conversion
        • Gemstone Colors
        • Created, Synthetic & Simulated Gemstones
        • Equivalents Chart
      • Engagement Rings
      • Diamond Earrings
      • Timepieces >
        • Vintage Rolex
        • Watch Terms
      • Ring Designs & Sizings >
        • Ring Width
        • Ring Size
      • Custom Jewelry
      • Metals
      • Engraving
      • Birthstones
      • Jewelry Care
      • Jewelry Terms
      • French Terms
  • Contact