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Marquise cut gemstone carat weight conversion chart.
Millimeter size to carat weight conversions for faceted marquise cut Gemstones.

This chart depicts optimum weights for marquise 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 the overall size for fit. See calibrated Gems to learn why. Use gemstone cut charts as a guide noting actual weights may vary within 10 percent.

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.
 

Marquise Faceted Gemstone Weight Chart (approximate weights)

4x2
mm

5x3
mm

6x3
mm

7x3.5
mm

8x4
mm

10x5
mm

12x6
mm

14x7
mm

Alexandrite

.07 ct

.20 ct

.30 ct

.50 ct

.70 ct

1.25 ct

2.10 ct

3.50 ct

Amethyst

.10 ct

.15 ct

.20 ct

.34 ct

.48 ct

.90 ct

1.59 ct

2.45 ct

Aquamarine

.08 ct

.14 ct

.20 ct

.25 ct

.50 ct

.80 ct

1.50 ct

2.75 ct

Citrine

.10 ct

.15 ct

.20 ct

.35 ct

.50 ct

.90 ct

1.59 ct

2.45 ct

Diamond

.12 ct

.18 ct

.25 ct

.37 ct

.50 ct

1.00 ct

2.00 ct

3.00 ct

Emerald

.09 ct

.19 ct

.30 ct

.45 ct

.60 ct

1.40 ct

1.80 ct

2.80 ct

Garnet

.09 ct

.16 ct

.25 ct

.42 ct

.60 ct

1.20 ct

2.00 ct

2.85 ct

Opal

.09 ct

.13 ct

.17 ct

.27 ct

.37 ct

.59 ct

1.00 ct

1.25 ct

Peridot

.10 ct

.17 ct

.25 ct

.37 ct

.50 ct

1.00 ct

2.00 ct

2.55 ct

Ruby

.13 ct

.24 ct

.35 ct

.55 ct

.75 ct

1.15 ct

2.20 ct

3.00 ct

Sapphire

.13 ct

.24 ct

.35 ct

.55 ct

.75 ct

1.15 ct

2.20 ct

3.00 ct

Topaz

.07 ct

.17 ct

.30 ct

.50 ct

.70 ct

1.20 ct

2.00 ct

3.40 ct

Tourmaline

.10 ct

.20 ct

.30 ct

.45 ct

.60 ct

.85 ct

1.55 ct

2.20 ct

Zircon

.13 ct

.23 ct

.33 ct

.55 ct

.75 ct

1.25 ct

1.95 ct

3.00 ct



 

 
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