Experience Watchmaking & Jewelry Repair

Round Diamonds Carats to
Millimeters (Plus or Minus 10%)

Use these charts to convert your MM Size in Diamonds to Carats. Some of our digital micrometers will convert this automatically.

MMCT MMCT
10.00571.25
1.20.00757.21.33
1.30.017.41.5
1.50.0157.61.6
1.70.027.81.75
1.80.02581.9
20.038.22
2.10.0358.42.15
2.20.048.62.25
2.40.058.82.5
2.50.0692.65
2.70.079.22.85
2.80.089.43
2.90.099.63.15
30.19.83.35
3.10.11103.5
3.20.1210.23.75
3.30.1410.44
3.40.1510.64.25
3.50.1610.84.45
3.60.17114.75
3.70.1811.25
3.80.211.45.25
3.90.2211.65.5
40.2311.755.75
4.10.2511.85.81
4.20.311.96
40.3312.16.25
4.50.3512.57
4.60.3812.857.5
4.80.4137.75
4.90.4313.18
50.4713.258.23
5.20.513.48.5
5.40.613.58.75
5.50.6313.659
5.60.6513.759.2
5.80.75149.75
60.814.510.34
6.20.851512
6.40.9515.412.92
6.5115.513.17
6.61.11614.5
6.81.17