Oval shape gemstone carat weight conversion chart

Oval Faceted Gemstone Weight Chart (approximate weights)

5x3
mm

6x4
mm

7x5
mm

8x6
mm

9x7
mm

10x8
mm

12x10
mm

Alexandrite

.30 ct

.51 ct

.80 ct

1.45 ct

2.00 ct

3.60 ct

6.00 ct

Amethyst

.23 ct

.45 ct

.85 ct

1.25 ct

1.75 ct

2.40 ct

4.50 ct

Aquamarine

.20 ct

.40 ct

.75 ct

1.10 ct

1.75 ct

2.25 ct

4.50 ct

Citrine

.23 ct

.45 ct

.85 ct

1.25 ct

1.75 ct

2.40 ct

4.20 ct

Diamond

.25 ct

.50 ct

.75 ct

1.40 ct

2.00 ct

3.00 ct

5.00 ct

Emerald

.25 ct

.52 ct

.85 ct

1.26 ct

1.90 ct

2.60 ct

5.00 ct

Garnet,
Mozambique

.25 ct

.55 ct

1.00 ct

1.40 ct

2.10 ct

2.80 ct

5.00 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

3.00 ct

Peridot

.28 ct

.50 ct

.95 ct

1.35 ct

2.00 ct

2.50 ct

4.00 ct

Ruby

.35 ct

.60 ct

1.06 ct

1.55 ct

2.20 ct

3.15 ct

6.00 ct

Sapphire

.35 ct

.60 ct

1.00 ct

1.55 ct

2.20 ct

3.15 ct

6.00 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

6.00 ct

Tourmaline

.25 ct

.50 ct

.90 ct

1.18 ct

2.30 ct

2.90 ct

5.25 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

7.50 ct

5x3
mm

6x4
mm

7x5
mm

8x6
mm

9x7
mm

10x8
mm

12x10
mm