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Diamond Metric, English, Carat conversions.
Welcome to our millimeters to carat conversion chart for round brilliant cut diamonds. This chart depicts weight for round cut diamonds. Use this chart as a guide noting that these figures are calculated for optimum cut diamonds and that actual weight can vary per quality of cut.

Find Metric/English conversions in our "Metric to Inch Conversion Chart". There is also a, very clear, short briefing on why physical size not carat weight is preferred in mounting gemstones or diamonds in jewelry at "About Calibrated Gemstones" that you should acquaint your self with.

We have highlighted some of the pertinent sizes for you to check and get a good idea of the actual size of a diamond. These charts are for diamonds and do not correlate to other types of gemstones.

For more diamond information. Visit our "Four C's diamond grading chart".

Find more gemstone information. Visit our "Gemstone" index.

 

Diamonds   Diamonds
Round
 Cut
Decimal
Inch
Round
 Cut
Decimal
Inch

mm
width

Decimal width

Weight

mm
width

Decimal width

Weight
1.0 mm .039 inch .005 carat 4.8 mm   .40 carat
1.2 mm   .008 carat 4.9 mm   .43 carat
1.3 mm   .01 carat 5.0 mm .197 inch .47 carat
1.5 mm   .015 carat 5.2 mm .205 inch 1/2 carat
1.7 mm   .02 carat 5.4 mm   .60 carat
1.8 mm   .025 carat 5.5 mm   .63 carat
2.0 mm .079 inch .03 carat 5.6 mm   .65 carat
2.1 mm   .035 carat 5.8 mm .228 inch 3/4 carat
2.2 mm   .04 carat 6.0 mm .236 inch .80 carat
2.4 mm   .05 carat 6.2 mm   .85 carat
2.5 mm   .06 carat 6.4 mm   .95 carat
2.7 mm   .07 carat 6.5 mm .255 inch
or 1/4 inch
1.00 carat
2.8 mm   .08 carat 6.6 mm   1.10 carat
2.9 mm   .09 carat 6.8 mm   1.17 carat
3.0 mm .118 inch 1/10 carat 7.0 mm .276 inch 1-1/4 carat
3.1 mm   .11 carat 7.2 mm   1.33 carat
3.2 mm .125 inch
or 1/8 inch
.12 carat 7.4 mm .291 inch 1-1/2 carat
3.3 mm   .14 carat 7.6 mm   1.60 carat
3.4 mm   .15 carat 7.8 mm .307 inch 1.75 carat
3.5 mm   .16 carat 8.0 mm .315 inch 1.90 carat
3.6 mm   .17 carat 8.2 mm 323 inch 2.00 carat
3.7 mm   .18 carat 8.4 mm   2.15 carat
3.8 mm .150 inch 1/5 carat 8.6 mm .338 inch 2.25 carat
3.9 mm   .22 carat 8.8 mm .346 inch 2.50 carat
4.0 mm .158 inch .23 carat 9.0 mm .354 inch 2.65 carat
4.1 mm .162 inch 1/4  carat 9.2 mm   2.85 carat
4.2 mm   .30 carat 9.4 mm .370 inch 3.00 carat
4.4 mm .173 inch .33 carat 9.6 mm   3.15 carat
4.5 mm   .35 carat 9.8 mm   3.35 carat
4.6 mm .181 inch 1/3 carat 10.0 mm .394 inch 3-1/2 carat

Carat conversion charts for gemstones.
Marquise cut gems, Octagon (emerald) cut chart,
Oval cut chart, Pear shape gems, Round cut gems,
Round diamond carat conversion chart

For more diamond information. Visit our "Four C's diamond grading chart".
Find more gemstone information. Visit our "Gemstone" index.


 

 
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