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MILLIMETER TO CARAT WEIGHT CONVERSION CHART
THE ACCURATE TOOL TO MEASURE DIAMONDs OR GEMSTONES IS WE THE USE OF A MILLIMETER GAGE

Millimeter Gage

 

mm

mm

mm

mm

mm

mm

mm

mm
CT Round Cut Diamond Marquis Shape Diamond Princess Cut Diamond Pear Shape Diamond Oval Shape Diamond Emerald Cut Diamond Heart Shape Diamond

Triangle Cut Diamond
0.05 2.4 3.5x2 1.8x1.8 3x2 - - - 2.5x2.5x2.5
0.10 3.0 4.5x2.5 2.5x2.5 4x2.5 - 3x2 3x3 3x3x3
0.15 3.4 5x2.5 2.8x2.8 4.5x3 - 3.5x2.5 3.5x3.5 3.5x3.5x3.5
0.18 3.7 - - - - - - 4x4x4
0.20 3.8 6x3 3x3 5x3.5 4.5x2.5 - 3.5x3.5 -
0.22 3.9 - - - - - - -
0.23 4.0 - - - - - - -
0.25 4.1 6.5x3.5 3.3x3.3 5.5x3.5 5x3 4.5x3.5 4x4 4.5x4.5x4.5
0.30 4.2 - 3.7x3.7 - - - - -
0.33 4.4 - - - - - - -
0.35 4.5 7.5x3.5 3.8x3.8 6.5x3.5 - 5x3 4.5x4.5 5x5x5
0.38 4.6 - - - 5x4 - - -
0.40 4.8 8x4 4x4 6.5x4.5 5.5x4     5.5x5.5x5.5
0.47 5.0 - - - - - - -
0.50 5.2 8.5x4 4.5x4.5 7x4.5 6.4 5.5x4.5 5.5 6x6x6
0.60 5.4 - 4.7x4.7 - - - - -
0.65 5.6 9x4.5 - 7.5x4.5 6.5x4.5 - 5.5x5.5 6.5x6.5x6.5
0.75 5.8 9.5x4.5 5x5 8x5 7x5 6x4 6x6 7x7x7
0.80 6.0 - - - - - - -
0.85 6.2 10x5 - 8.5x5 - 6.5x5   7.5x7.5x7.5
0.95 6.4 - - - - - - -
1.00 6.5 10.5x5 6x6 9x5.5 7.5x5.5 7x5 6.5x6.5 8x8x8
1.10 6.6 - - - - - - -
1.17 6.8 - - - - - - -
1.25 7.0 11x5.5 - 9.5x6 8x6 - - 8.5x8.5x8.5
1.33 7.2 - - - - - - -
1.50 7.4 12x6 6.5x6.5 10x6 8.5x6.5 8x6 7x7 9x9x9
1.60 7.6 - - - - - - -
1.75 7.8 - - 10.5x6.5 9x6 - 7.5x7.5 9.5x9.5x9.5
1.90 8.0 - - - - - - -
2.00 8.2 13x6.5 7x7 11x7 9x7 8.5x6 8x8 10x10x10
2.15 8.4 - - - - - - -
2.25 8.6 13.5x7 - 11.5x7 - - - -
2.50 8.8 14x7 7.5x7.5 12x7.5 9x7.5 9x7 8.5x8.5 -
2.65 9.0 - - - - - - -
2.75 9.1 14.5x7.5 - 12.5x7.5 9.5x7.5 - - -
2.85 9.2 - - - - - - -
3.00 9.4 15x7.5 8x8 12.5x8 10x8 10x8 9x9 -
3.15 9.6 - - - - - - -
3.25 9.7 - - 13x8 - - - -
3.35 9.8 - - - - - - -
3.50 10.0 16x8 - 13.5x8.5 10x8.5 - 9.5x9.5 -
3.60 10.1 - - - - - - -
3.75 10.2 - - 14x8.5 - - - -
4.00 10.4 16.5x8.5 - 14x9 11x9 11x9 10x10 -
4.25 10.6 - - - - - - -
4.75 11.0 - - - - - - -
5.00 11.2 18x9 - 15x9.5 12x10 12x10 11x11 -
Please Note That These Are Approximate Measurements
Due To Variations Bulge Factors, Symmetry.