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Diamond size to weight

mm size : weight : sieve plate size chart for melee diamonds

Standard conversions - If the stone does not qualify the standard proportions to be an ideal or excellent cut and symmetry which includes proportions of height, crown, culet, pavilion of the stone, girdle (thick or thin) then the conversions coming wont verify with these charts given. The inclusions even makes minor differences in weight to dimensions sometime as the substance in inclusion may weight less for a given volume.

The diamond sieve size with respective carat weight also given in table.

 

 

 

 

MM to Ct weight chart for round brilliant cut diamonds natural and Lab Grown 'CVD'

FROM MM TO MM Stones per carat Weight of each stone SIEVE PLATE
0.70 0.75 630 0.0017 ct  
0.75 0.80 570 0.0019 ct  
0.80 0.85 380 0.0024 ct  
0.85 0.90 320 0.0029 ct  
0.90 0.95 295 0.0034 ct  
0.95 1.00 250 0.0040 ct 0.00
1.0 1.05 220 0.0045 ct  
1.05 1.10 190 0.0053 ct  
1.10 1.15 160 0.0062 ct 0
1.15 1.20 143 0.0070 ct 1.00
1.20 1.25 130 0.0077 ct 1.5
1.25 1.30 115 0.0087 ct 2.00
1.30 1.35 103 0.0097 ct 2.5
1.35 1.40 93 0.0108 ct 3.0
1.40 1.45 84 0.0120 ct 3.5
1.45 1.50 75 0.0133 ct 4.00
1.50 1.55 65 0.0154 ct 4.5
1.55 1.60 62 0.0161 ct 5.0
1.60 1.65 56 0.0179 ct 5.5
1.65 1.70 52 0.0192 ct 5.75
1.70 1.75 48 0.0208 ct 6
1.75 1.80 44 0.0227 ct 6.25
1.80 1.85 41 0.0244 ct 6.5
1.85 1.90 37 0.0270 ct 6.75
1.90 1.95 35 0.0286 ct 7
1.95 2.0 32 0.0313 ct 7.25
2.0 2.05 29 0.0345 ct 7.5
2.05 2.10 26 0.0385 ct 7.75
2.10 2.15 25 0.0400 ct 8
2.15 2.20 24 0.0417 ct 8.25
2.20 2.25 22 0.0454 ct 8.5
2.25 2.30 20 0.0500 ct 8.75
2.30 2.35 18.5 0.0541 ct 9
2.35 2.40 18 0.0556 ct 9.25
2.40 2.45 17 0.0589 ct 9.5
2.45 2.50 16.5 0.0606 ct 9.75
2.50 2.55 16 0.0625 ct 10
2.55 2.60 15.5 0.0645 ct 10.25
2.60 2.65 14.5 0.0690 ct 10.5
2.65 2.70 14 0.0714 ct 10.75
2.70 2.75 13.5 0.0740 ct 11
2.75 2.80 12.5 0.0800 ct 11.25
2.80 2.85 12 0.0833 ct 11.5
2.85 2.90 11 0.0901 ct 11.75
2.90 2.95 10.5 0.0952 ct 12
2.95 3.00 9.5 0.1053 ct 12.25
3 3.05 10 0.101 ct 12.5
3.05 3.1 10 0.107 ct 12.75
3.1 3.15 9 0.114 ct 13
3.15 3.2 9 0.1202 ct 13.25
3.2 3.25 8 0.1301 ct 13.25
3.25 3.3 8 0.135 ct 13.75
3.3 3.35 8 0.14 ct 14
3.35 3.4 7.5 0.145 ct 14.25
3.4 3.45 7.5 0.149 ct 14.5
3.45 3.5 7 0.156 ct 14.75
3.5 3.55 6 0.161 ct 15
3.55 3.6 6 0.168 ct 15.25
3.6 3.65 6.5 0.173 ct 15.5
3.65 3.7 6.5 0.185 ct 15.75
3.7 3.75 5 0.196 ct 16
3.75 3.8 5 0.205 ct 16.25
3.8 3.85 5 0.217 ct 16.5
3.85 3.9 4.25 0.228 ct 16.75
3.95 4 4.25 0.236 ct 17
4 4.05 4 0.249999 ct 17.5

 

 

Cushion cut shape

 

MM Size

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.

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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.

12 mm.

9.52 ct.

13 mm.

12.66 ct.

 

 

 

 

 

Pear Shape

MM Size

Carat Weight

2 mm.

0.13 ct.

2.5 mm.

0.18 ct.

3 mm.

0.21 ct.

3 mm.

0.25 ct.

4 mm.

0.35 ct.

4 mm.

0.50 ct.

4.5 mm.

0.60 ct.

5 mm.

0.75 ct.

5.5mm.

0.85 ct.

5.7 mm.

1.00 ct.

6 mm.

1.25 ct.

6.5 mm.

1.50 ct.

6 mm.

1.71 ct.

6.7 mm.

1.80 ct.

7 mm.

2.00 ct.

8 mm.

2.50 ct.

7.50 mm.

2.61 ct.

8 mm.

2.98 ct.

8 mm.

3.00 ct.


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