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Round brilliant cut gemstone carat weight conversion chart.
Millimeter size to carat weight conversions for faceted gemstones.

This chart depicts optimum weights for round cut gemstones. Actual weights may vary due many factors related to the best recovery of raw material as accessed by a skilled lapidary.

In jewelry the primary goal is to calibrate a gemstones overall size for fit in mountings.
See
About Calibrated Gems to learn why.

Round Faceted Gemstone Weight Chart (approximate weights)

2
mm

3
mm

4
mm

5
mm

6
mm

6.5
mm

7
mm

8
mm

10
mm

Alexandrite

.04 ct

.12 ct

.35 ct

.63 ct

1.30 ct

1.86 ct

2.15 ct

2.90 ct

5.20 ct

Amethyst

.04 ct

.10 ct

.20 ct

.40 ct

.70 ct

1.10 ct

1.30 ct

1.80 ct

3.30 ct

Aquamarine

.04 ct

.10 ct

.25 ct

.45 ct

.75 ct

1.31 ct

1.60 ct

2.40 ct

3.50 ct

Citrine

.04 ct

.10 ct

.20 ct

.40 ct

.70 ct

1.10 ct

1.30 ct

1.80 ct

3.30 ct

Diamond

.03 ct

.10 ct

.23 ct

.47 ct

.80 ct

1.00 ct

1.25 ct

1.90 ct

3.50 ct

Emerald

.04 ct

.12 ct

.27 ct

.48 ct

.80 ct

1.26 ct

1.70 ct

2.50 ct

6.10 ct

Garnet

.05 ct

.13 ct

.30 ct

.60 ct

1.00 ct

1.40 ct

1.60 ct

2.50 ct

5.75 ct

Opal

.02 ct

.09 ct

.16 ct

.34 ct

.57 ct

.75 ct

.83 ct

1.30 ct

2.00 ct

Peridot

.05 ct

.12 ct

.26 ct

.50 ct

.85 ct

1.11 ct

1.25 ct

2.00 ct

5.25 ct

Ruby

.05 ct

.15 ct

.34 ct

.65 ct

1.05 ct

1.41 ct

1.60 ct

2.25 ct

4.50 ct

Sapphire

.05 ct

.15 ct

.34 ct

.65 ct

1.05 ct

1.41 ct

1.60 ct

2.25 ct

4.50 ct

Topaz

.04 ct

.11 ct

.30 ct

.56 ct

1.00 ct

1.36 ct

1.55 ct

2.50 ct

5.75 ct

Tourmaline

.04 ct

.12 ct

.24 ct

.45 ct

.75 ct

1.28 ct

1.55 ct

2.00 ct

3.00 ct

Zircon

.06 ct

.17 ct

.36 ct

.69 ct

1.25 ct

1.58 ct

1.75 ct

2.60 ct

5.00 ct

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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