Emerald (octagon) cut, carat weight conversions

Emerald (octagon) Faceted Gemstone Weight Chart (approximate weights)

5x3
mm

6x4
mm

7x5
mm

8x6
mm

9x7
mm

10x8
mm

11x9
mm

12x10
mm

Alexandrite

.40 ct

.70 ct

1.30 ct

2.60 ct

3.60 ct

4.20 ct

6.00 ct

8.50 ct

Amethyst

.35 ct

.55 ct

1.00 ct

1.60 ct

2.25 ct

2.90 ct

4.20 ct

5.60 ct

Aquamarine

.25 ct

.50 ct

.80 ct

1.40 ct

2.00 ct

3.00 ct

4.30 ct

4.75 ct

Citrine

.35 ct

.55 ct

1.00 ct

1.60 ct

2.25 ct

2.90 ct

4.20 ct

5.60 ct

Diamond

.25 ct

.50 ct

1.00 ct

1.50 ct

3.00 ct

4.00 ct

5.00 ct

7.80 ct

Emerald

.30 ct

.60 ct

.90 ct

1.80 ct

2.31 ct

3.15 ct

4.50 ct

5.25 ct

Garnet

.40 ct

.80 ct

1.20 ct

1.70 ct

2.50 ct

3.50 ct

4.30 ct

6.35 ct

Peridot

.35 ct

.60 ct

1.00 ct

1.70 ct

2.25 ct

3.80 ct

5.25 ct

6.25 ct

Ruby

.55 ct

.75 ct

1.15 ct

1.60 ct

2.30 ct

2.75 ct

4.00 ct

6.25 ct

Sapphire

.55 ct

.75 ct

1.15 ct

1.75 ct

2.30 ct

2.75 ct

4.00 ct

6.25 ct

Topaz

.40 ct

.65 ct

1.25 ct

2.40 ct

3.40 ct

4.00 ct

5.75 ct

8.00 ct

Tourmaline

.30 ct

.60 ct

1.60 ct

2.15 ct

2.80 ct

3.60 ct

4.30 ct

5.20 ct

Zircon

.60 ct

.85 ct

1.70 ct

2.35 ct

3.90 ct

4.50 ct

6.20 ct

7.01 ct