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The weight of gemstones and diamonds is measuredin carat and gam. One carat is equal
to 0.2 grams. The word "carat" is taken from the carob seeds that people once used
in ancient times to balance scale
Gold is measured in karat, referring to the perrcenttage
of gold in alloys. Karat,in gold measurement, is usually written with a capital
"K" or "Kt" to provide a distinction from "carat" for gemstones measurement. |
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Gemstone Average weight by size |
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Shape |
Round |
Oval |
Square |
|
Size in mm |
2 |
2.5 |
3 |
3.5 |
4 |
5 |
6 |
7 |
5x3 |
6x4 |
7x5 |
8x6 |
9x7 |
10x8 |
12x10 |
14x10 |
2x2 |
3x3 |
4x4 |
|
Stone |
Sapphire Ruby Ganet |
|
weight in ct |
0.04 |
0.08 |
0.15 |
0.25 |
0.35 |
0.65 |
1.00 |
1.60 |
0.35 |
0.60 |
1.00 |
1.50 |
2.20 |
3.10 |
6.00 |
7.25 |
0.06 |
0.25 |
0.45 |
|
Stone |
Tapaz |
|
weight in ct |
0.035 |
0.07 |
0.15 |
0.20 |
0.30 |
0.60 |
1.00 |
1.60 |
0.30 |
0.55 |
0.95 |
1.45 |
2.10 |
3.00 |
5.80 |
7.00 |
|
0.25 |
0.45 |
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Stone |
Tanzanite Peridot Tourmaline |
|
weight in ct |
0.035 |
0.07 |
0.13 |
0.20 |
0.25 |
0.50 |
0.90 |
1.25 |
0.25 |
0.50 |
0.90 |
1.35 |
1.80 |
2.50 |
4.00 |
6.00 |
0.05 |
0.20 |
0.40 |
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Stone |
Emerrald Aquamarine Amethyst Citrine lolite |
|
weight in ct |
0.028 |
0.055 |
0.10 |
0.15 |
0.23 |
0.45 |
0.80 |
1.20 |
0.22 |
0.45 |
0.75 |
1.20 |
1.70 |
2.40 |
4.10 |
5.10 |
0.04 |
0.15 |
0.35 |
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