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Oval shape gemstone carat weight conversion chart.
Millimeter size to carat weight conversions for faceted oval cut Gemstones.
This chart depicts optimum weights for oval 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.

 

Oval Faceted Gemstone Weight Chart (approximate weights)

5x3
mm

6x4
mm

7x5
mm

8x6
mm

9x7
mm

10x8
mm

11x9
mm

12x10
mm

14x10
mm

Alexandrite

.30 ct

.51 ct

.80 ct

1.45 ct

2.00 ct

3.60 ct

4.25 ct

6.00 ct

8.90 ct

Amethyst

.23 ct

.45 ct

.85 ct

1.25 ct

1.75 ct

2.40 ct

3.20 ct

4.50 ct

6.50 ct

Aquamarine

.20 ct

.40 ct

.75 ct

1.10 ct

1.75 ct

2.25 ct

3.00 ct

4.50 ct

6.75 ct

Citrine

.23 ct

.45 ct

.85 ct

1.25 ct

1.75 ct

2.40 ct

3.25 ct

4.20 ct

5.20 ct

Diamond

.25 ct

.50 ct

.75 ct

1.40 ct

2.00 ct

3.00 ct

4.00 ct

5.00 ct

8.00 ct

Emerald

.25 ct

.52 ct

.85 ct

1.26 ct

1.90 ct

2.60 ct

3.75 ct

5.00 ct

7.50 ct

Garnet,
Mozambique

.25 ct

.55 ct

1.00 ct

1.40 ct

2.10 ct

2.80 ct

3.75 ct

5.00 ct

7.00 ct

Garnet,
Rhodolite

.25 ct

.55 ct

1.00 ct

1.40 ct

2.10 ct

2.80 ct

-

-

-

Iolite

.21 ct

.40 ct

.63 ct

1.02 ct

-

-

-

-

-

Opal

.16 ct

.28 ct

.47 ct

.78 ct

1.10 ct

1.65 ct

2.15 ct

3.00 ct

4.00 ct

Peridot

.28 ct

.50 ct

.95 ct

1.35 ct

2.00 ct

2.50 ct

3.50 ct

4.00 ct

6.00 ct

Ruby

.35 ct

.60 ct

1.06 ct

1.55 ct

2.20 ct

3.15 ct

3.80 ct

6.00 ct

7.25 ct

Sapphire

.35 ct

.60 ct

1.00 ct

1.55 ct

2.20 ct

3.15 ct

3.80 ct

6.00 ct

7.25 ct

Tanzanite

.20 ct

.48 ct

.89 ct

1.35 ct

-

-

-

-

-

Topaz

.28 ct

.57 ct

1.10 ct

1.60 ct

2.50 ct

3.50 ct

4.50 ct

6.00 ct

8.80 ct

Tourmaline

.25 ct

.50 ct

.90 ct

1.18 ct

2.30 ct

2.90 ct

3.50 ct

5.25 ct

6.80 ct

Tsavorite

.28 ct

.52 ct

.75 ct

-

-

-

-

-

-

Zircon

.40 ct

.75 ct

1.45 ct

2.00 ct

2.85 ct

4.00 ct

5.60 ct

7.50 ct

8.20 ct

5x3
mm

6x4
mm

7x5
mm

8x6
mm

9x7
mm

10x8
mm

11x9
mm

12x10
mm

14x10
mm

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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