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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.
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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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