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Diamond Size Chart

Diamond size refers to the mm size of the stone.  This is a millimeters to carat conversion chart for different shape diamonds. Use these charts as a guide noting that these figures are calculated for optimum shape diamonds and that actual carat weight can vary per quality of cut.
 
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Diamond Carat Size Conversion Chart

   Round  Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
1.0 .005 4.8 .40
1.2 .008 4.9 .43
1.3 .01 5.0 .47
1.5 .015 5.2 1/2
1.7 .02 5.4 .60
1.8 .025 5.5 .63
2.0 .03 5.6 .65
2.1 .035 5.8 3/4
2.2 .04 6.0 .80
2.4 .05 6.2 .85
2.5 .06 6.4 .95
2.7 .07 6.5 1.00
2.8 .08 6.6 1.10
2.9 .09 6.8 1.17
3.0 1/10 7.0 1-1/4
3.1 .11 7.2 1.33
3.2 .12 7.4 1-1/2
3.3 .14 7.6 1.60
3.4 .15 7.8 1.75
3.5 .16 8.0 1.90
3.6 .17 8.2 2.00
3.7 .18 8.4 2.15
3.8 1/5 8.6 2.25
3.9 .22 8.8 2.50
4.0 .23 9.0 2.65
4.1 1/4 9.2 2.85
4.2 .30 9.4 3.00
4.4 .33 9.6 3.15
4.5 .35 9.8 3.35
4.6 1/3 10.0 3-1/2

 

   Princess Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
2.0 .06 4.42 .35
2.25 .08 4.5 .40
2.5 .10 4.75 .50
2.75 .13 5.0 .63
3.0 .15 5.25 .75
3.25 .20 5.5 1.00
3.5 .23 6.0 1.25
3.75 .25 7.0 1.60
4.0 .30 8.0 2.25


   Oval  Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
4 X 3 .20 8.5 x 6.5 1.50
5 X 3 .25 9 x 6 1.75
5 X 3.5 .33 9 x 7 2.00
5 X 4 .40 9.5 x 7.5 2.5
6 X 4 .50 10 x 8 3.00
6.5 X 4.5 .65 10 x 8.5 3.5
7 X 5 .75 11 x 9 4.00
7.5 X 5.5 1.00 11 x 9.5 4.50
8 X 6 1.25 12 x 10 5.00



   Pear Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
4 x 2 .20 10 x 7 2.00
5 x 3 .30 12 x 7 2.50
6 x 4 .50 12 x 8 3.00
7 x 5 .75 13 x 8 3.50
8 x 5 1.00 14 x 8 4.00
9 x 6 1.50 15 x 9 5.00




   Heart  Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
3.8 .20 6.0 .75
4.0 .25 6.5 1.00
4.5 .35 7.0 1.25
4.7 .40 7.5 1.50
5.0 .50 8.0 2.00
5.5 .60    


   Marquise  Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
3.5 x 1.5 .07 9.5 x 4.5 .85
4 x 2 .10 10 x 4.75 1.00
5 x 2 .20 10 x 5 1.25
5 x 3 .22 11 x 5 1.50
5.5 x 2.5 .25 11 x 5.5 1.65
6 x 6 .30 12 x 6 2.00
7 x 3 .35 13 x 5.5 2.50
7 x 3.5 .38 13 x 6 2.65
7 x 4 .40 14 x 6.5 2.87
8 x 4 .50 14 x 7 3.00
8.5 x 4.5 .65 15 x 7 3.75
9 x 4 .70 16 x 8 4.50
9 x 4.5 .75 18 x 9 7.00
9 x 5 .80 20 x 10 10

   Emerald Cut

mm width

Carat Weight(cts)

mm width

Carat Weight(cts)
4 x 3 .20 8.5 x 6.5 2.00
5 x 3 .25 9 x 7 2.50
6 x 4 .50 10 x 8 3.00
6.5 x 4.5 .75 11 x 9 4.00
7 x 5 1.00 12 x 10 5.00
8 x 6 1.50    

Related Link:    Ring Size Chart  Bracelet Size Chart  Necklace Size Chart  Ear Gauge Size Chart


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