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CONVERSION CHARTS

Use these charts to look up the approximate carat weight
of your favorite gemstone by measuring the MM size


Round 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

 

Marquise Faceted Gemstone Weight Chart (Weights are approximate)

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

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

 

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

Diamond

.25 ct

.50 ct

1.00 ct

1.50 ct

3.00 ct

4.00 ct

5.00 ct

7.80 ct

8.80 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

 

 

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

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

 

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

Diamond

.25 ct

.50 ct

.75 ct

1.00 ct

1.50 ct

2.00 ct

3.50 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

 

Diamond Conversion Charts

DiamondsDiamonds
Round
Cut
Decimal
Inch
Round
Cut
Decimal
Inch

mm
width

decimal width

Weight

mm
width

decimal width

Weight
1.0 mm.039 inch.005 carat4.8 mm.40 carat
1.2 mm.008 carat4.9 mm.43 carat
1.3 mm.01 carat5.0 mm.197 inch.47 carat
1.5 mm.015 carat5.2 mm.205 inch1/2 carat
1.7 mm.02 carat5.4 mm.60 carat
1.8 mm.025 carat5.5 mm.63 carat
2.0 mm.079 inch.03 carat5.6 mm.65 carat
2.1 mm.035 carat5.8 mm.228 inch3/4 carat
2.2 mm.04 carat6.0 mm.236 inch.80 carat
2.4 mm.05 carat6.2 mm.85 carat
2.5 mm.06 carat6.4 mm.95 carat
2.7 mm.07 carat6.5 mm.255 inch
or 1/4 inch
1.00 carat
2.8 mm.08 carat6.6 mm1.10 carat
2.9 mm.09 carat6.8 mm1.17 carat
3.0 mm.118 inch1/10 carat7.0 mm.276 inch1-1/4 carat
3.1 mm.11 carat7.2 mm1.33 carat
3.2 mm.125 inch
or 1/8 inch
.12 carat7.4 mm.291 inch1-1/2 carat
3.3 mm.14 carat7.6 mm1.60 carat
3.4 mm.15 carat7.8 mm.307 inch1.75 carat
3.5 mm.16 carat8.0 mm.315 inch1.90 carat
3.6 mm.17 carat8.2 mm323 inch2.00 carat
3.7 mm.18 carat8.4 mm2.15 carat
3.8 mm.150 inch1/5 carat8.6 mm.338 inch2.25 carat
3.9 mm.22 carat8.8 mm.346 inch2.50 carat
4.0 mm.158 inch.23 carat9.0 mm.354 inch2.65 carat
4.1 mm.162 inch1/4  carat9.2 mm2.85 carat
4.2 mm.30 carat9.4 mm.370 inch3.00 carat
4.4 mm.173 inch.33 carat9.6 mm3.15 carat
4.5 mm.35 carat9.8 mm3.35 carat
4.6 mm.181 inch1/3 carat10.0 mm.394 inch3-1/2 carat

Sumber: http://www.brilliancejewelry.com/Gemstones/conversion.html