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                     Conversion rate :
  1 millimeter (mm) = 0.0393700787 inch (in)
  1 inch (in)          = 25.4 millimeters (mm)
 

Oval Cut

Oval Faceted Gemstone Weight Chart (approximate weights)
5x3mm 6x4mm 7x5mm 8x6mm 9x7mm 10x8mm 11x9mm 12x10mm 14x10mm
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

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

.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

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

5x3mm

6x4mm

7x5mm

8x6mm

9x7mm

10x8mm

11x9mm

12x10mm

14x10mm

Pear shape.
Pear Faceted Gemstone Weight Chart (approximate weights)

5x3mm

6x4mm

7x5mm

8x6mm

9x6mm

10x7mm

12x8mm

14x9mm

 Alexandrite

.30 ct

.50 ct

.85 ct

1.10 ct

2.10 ct

3.60 ct

6.60 ct

8.80 ct

Amethyst

.20 ct

.35 ct

.65 ct

.85 ct

1.25 ct

1.70 ct

4.00 ct

5.00 ct

Aquamarine

.20 ct

.35 ct

.65 ct

.90 ct

1.30 ct

1.85 ct

4.20 ct

5.60 ct

Citrine

.20 ct

.35 ct

.65 ct

.85 ct

1.30 ct

1.70 ct

4.00 ct

5.00 ct

Emerald

.25 ct

.45 ct

.70 ct

1.05 ct

1.70 ct

2.60 ct

4.15 ct

6.10 ct

Garnet

.25 ct

.40 ct

1.00 ct

1.15 ct

1.30 ct

1.80 ct

3.50 ct

5.80 ct

Opal

.13 ct

.22 ct

.35 ct

.50 ct

.70 ct

1.03 ct

1.40 ct

2.45 ct

Peridot

.25 ct

.45 ct

.70 ct

.80 ct

1.10 ct

1.40 ct

3.40 ct

4.75 ct

Ruby

.30 ct

.50 ct

.75 ct

1.00 ct

1.85 ct

2.50 ct

4.75 ct

7.90 ct

Sapphire

.30 ct

.50 ct

.75 ct

1.00 ct

1.85 ct

2.50 ct

4.75 ct

7.90 ct

Topaz

.25 ct

.50 ct

1.00 ct

1.10 ct

2.00 ct

3.50 ct

6.50 ct

8.50 ct

Tourmaline

.35 ct

.45 ct

.60 ct

.90 ct

1.10 ct

1.40 ct

2.80 ct

6.75 ct

Zircon

.30 ct

.70 ct

1.00 ct

1.30 ct

2.60 ct

4.00 ct

5.25 ct

7.50 ct

Round Cut Gemstones
Round Faceted Gemstone Weight Chart (approximate weights)

2mm

3mm

4mm

5mm

6mm

6.5mm

7mm

8mm

10mm

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

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

Emerald Cut (octagon cut)
Octagon Faceted Gemstone Weight Chart (approximate weights)

5x3mm

6x4mm

7x5mm

8x6mm

9x7mm

10x8mm

11x9mm

12x10mm

14x10mm

Alexandrite

.40 ct

.70 ct

1.30 ct

2.60 ct

3.60 ct

4.20 ct

6.00 ct

8.50 ct

9.90 ct

Amethyst

.35 ct

.55 ct

1.00 ct

1.60 ct

2.25 ct

2.90 ct

4.20 ct

5.60 ct

7.25 ct

Aquamarine

.25 ct

.50 ct

.80 ct

1.40 ct

2.00 ct

3.00 ct

4.30 ct

4.75 ct

7.75 ct

Citrine

.35 ct

.55 ct

1.00 ct

1.60 ct

2.25 ct

2.90 ct

4.20 ct

5.60 ct

7.25 ct

Emerald

.30 ct

.60 ct

.90 ct

1.80 ct

2.31 ct

3.15 ct

4.50 ct

5.25 ct

5.80 ct

Garnet

.40 ct

.80 ct

1.20 ct

1.70 ct

2.50 ct

3.50 ct

4.30 ct

6.35 ct

9.00 ct

Peridot

.35 ct

.60 ct

1.00 ct

1.70 ct

2.25 ct

3.80 ct

5.25 ct

6.25 ct

8.80 ct

Ruby

.55 ct

.75 ct

1.15 ct

1.60 ct

2.30 ct

2.75 ct

4.00 ct

6.25 ct

9.00 ct

Sapphire

.55 ct

.75 ct

1.15 ct

1.75 ct

2.30 ct

2.75 ct

4.00 ct

6.25 ct

9.00 ct

Topaz

.40 ct

.65 ct

1.25 ct

2.40 ct

3.40 ct

4.00 ct

5.75 ct

8.00 ct

9.50 ct

Tourmaline

.30 ct

.60 ct

1.60 ct

2.15 ct

2.80 ct

3.60 ct

4.30 ct

5.20 ct

8.50 ct

Zircon

.60 ct

.85 ct

1.70 ct

2.35 ct

3.90 ct

4.50 ct

6.20 ct

7.01 ct

8.95 ct

Marquise Cut
Marquise Faceted Gemstone Weight Chart (approximate weights)

4x2mm

5x3mm

6x3mm

7x3.5mm

8x4mm

10x5mm

12x6mm

14x7mm

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

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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