Diamond Size Chart (Diamond Carat Size Conversion Chart) -- e-Tools Age

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.


Diamond Price Calculator	Diamond Size Chart	Diamond Shapes Chart	Diamond Clarity Chart

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

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