Gemstones Carat Weight Calculator
Calculates the approximate carat weight based on average specific gravity (see. the table below), gridle length, gridle width, depth.
Step by Step calculation
Gemstones Carat Weight Calculation Formulae
Carats Value formula = Facet Style Factor × Gridle Length × Gridle Width × Depth × Average Specific Gravity
Gemstone Characteristics Table
| Gemstone Name | Avg.Specific Gravity | Mohs Hardness | Index Refraction | Gemstone Family |
|---|---|---|---|---|
| Achorite | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.610 - 1.661 | Tourmaline |
| Agate | 2.65 | 7.0 Mohs | 1.530 - 1.550 | Quartz |
| Alexandrite | 3.68 - 3.78 | 8.5 Mohs | 1.746 - 1.755 | Chrysoberyl |
| Almandine | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.750 - 1.830 | Garnet |
| Almandine Spinel | 3.58 - 4.06 | 8.0 Mohs | 1.708 - 1.735 | Spinel |
| Almandine-Spessartine | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.750 - 1.830 | Garnet |
| Amazonite | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.518 - 1.526 | Feldspar |
| Amethyst | 2.65 | 7.0 Mohs | 1.532 - 1.554 | Quartz |
| Andradite | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.880 - 1.940 | Garnet |
| Aquamarine | 2.63 - 2.91 | 7.5 - 8.0 Mohs | 1.567 - 1.590 | Beryl |
| Balas Ruby | 3.58 - 4.06 | 8.0 Mohs | 1.708 - 1.735 | Spinel |
| Black Opal | 1.98 - 2.25 | 5.5 - 6.5 Mohs | 1.440 - 1.460 | Opal |
| Bloodstone | 2.65 | 7.0 Mohs | 1.535 - 1.539 | Quartz |
| Brazilian Emerald | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.610 - 1.640 | Tourmaline |
| Cairngorm | 2.65 | 7.0 Mohs | 1.540 - 1.550 | Quartz |
| Carnelian | 2.65 | 7.0 Mohs | 1.530 - 1.550 | Quartz |
| Cat's Eye | 3.68 - 3.78 | 8.5 Mohs | 1.746 - 1.755 | Chrysoberyl |
| Chalcedony | 2.65 | 7.0 Mohs | 1.544 - 1.553 | Quartz |
| Chlorspinel | 3.58 - 4.06 | 8.0 Mohs | 1.712 - 1.717 | Spinel |
| Chrome Pyrope | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Chrysoberyl | 3.68 - 3.78 | 8.5 Mohs | 1.746 - 1.755 | Chrysoberyl |
| Chrysoprase | 2.65 | 7.0 Mohs | 1.530 - 1.550 | Quartz |
| Citrine | 2.65 | 7.0 Mohs | 1.532 - 1.554 | Quartz |
| Color-Change Garnet | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Demantoid | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.880 - 1.900 | Garnet |
| Diamond | 3.51 | 10 Mohs | 2.417 | Diamond |
| Dravite | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.610-1.661 | Tourmaline |
| Emerald | 2.63 - 2.91 | 7.5 - 8.0 Mohs | 1.560 - 1.605 | Beryl |
| Feldspar | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.518 - 1.572 | Feldspar |
| Fire Opal | 1.98 - 2.25 | 5.5 - 6.5 Mohs | 1.430 - 1.460 | Opal |
| Garnet | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Ghanospinel | 3.58 - 4.06 | 8.0 Mohs | 1.712 - 1.747 | Spinel |
| Goshenite | 2.63 - 2.91 | 7.5 - 8.0 Mohs | 1.570 - 1.600 | Beryl |
| Green Quartz | 2.65 | 7.0 Mohs | 1.540-1.550 | Quartz |
| Grossular | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.880 - 1.940 | Garnet |
| Heliodore | 2.63 - 2.91 | 7.5 - 8.0 Mohs | 1.570 - 1.600 | Beryl |
| Heliotrope | 2.65 | 7.0 Mohs | 1.535 - 1.539 | Quartz |
| Hessonite | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Hyacinth | 4.60 - 4.70 | 7.5 Mohs | 1.777 - 1.987 | Zircon |
| Indicolite | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.610 - 1.640 | Tourmaline |
| Jade | 2.90 - 3.10 | 6.0 Mohs | 1.640 - 1.667 | Jade |
| Jadeite | 2.90 - 3.10 | 6.0 Mohs | 1.640 - 1.667 | Jade |
| Jargon | 4.60 - 4.70 | 7.5 Mohs | 1.777 - 1.987 | Zircon |
| Jasper | 2.65 | 7.0 Mohs | 1.540 - 1.550 | Quartz |
| Labradorite | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.560 - 1.572 | Feldspar |
| Lapis Lazuli | 2.70 - 2.90 | 5.0 - 5.5 Mohs | 1.500 - 1.550 | Lapis Lazuli |
| Malaia | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.880 - 1.940 | Garnet |
| Matura Diamond | 4.60 - 4.70 | 7.5 Mohs | 1.777 - 1.987 | Zircon |
| Moonstone | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.518 - 1.526 | Feldspar |
| Morganite | 2.63 - 2.91 | 7.5 - 8.0 Mohs | 1.585 - 1.594 | Beryl |
| Morion | 2.65 | 7.0 Mohs | 1.540 - 1.550 | Quartz |
| Nephrite | 2.90 - 3.10 | 6.0 Mohs | 1.600 - 1.641 | Jade |
| Onyx | 2.65 | 7.0 Mohs | 1.531 - 1.539 | Quartz |
| Opal | 1.98 - 2.25 | 5.5 - 6.5 Mohs | 1.440 - 1.460 | Opal |
| Orthoclase | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.518 - 1.526 | Feldspar |
| Peridot | 3.22 - 3.45 | 7.0 Mohs | 1.635 - 1.690 | Peridot |
| Peristerite | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.560 - 1.572 | Feldspar |
| Praziolite | 2.65 | 7.0 Mohs | 1.540 - 1.550 | Quartz |
| Pyrope | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Pyrope-Almandine | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Pyrope-Spessartine | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.730 - 1.760 | Garnet |
| Quartz | 2.65 | 7.0 Mohs | 1.544 - 1.553 | Quartz |
| Red Beryl | 2.63 - 2.91 | 7.5 - 8.0 Mohs | 1.570 - 1.598 | Beryl |
| Rhodolite | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.740 - 1.770 | Garnet |
| Rock Crystal | 2.65 | 7.0 Mohs | 2.000 | Quartz |
| Rose Quartz | 2.65 | 7.0 Mohs | 1.540 - 1.550 | Quartz |
| Rubellite | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.610 - 1.640 | Tourmaline |
| Rubicelle | 3.58 - 4.06 | 8.0 Mohs | 1.712 - 1.717 | Spinel |
| Ruby | 3.96 - 4.05 | 9.0 Mohs | 1.757 - 1.779 | Corundum |
| Sapphire | 3.96 - 4.05 | 9.0 Mohs | 1.757 - 1.779 | Corundum |
| Sapphire Spinel | 3.58 - 4.06 | 8.0 Mohs | 1.712 - 1.747 | Spinel |
| Siberite | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.625 - 1.675 | Tourmaline |
| Smoky Quartz | 2.65 | 7.0 Mohs | 1.540 - 1.550 | Quartz |
| Spessartine | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.790 - 1.810 | Garnet |
| Spinel | 3.58 - 4.06 | 8.0 Mohs | 1.712 - 1.717 | Spinel |
| Sunstone | 2.55 - 2.76 | 6.0 - 6.5 Mohs | 1.560 - 1.572 | Feldspar |
| Topaz | 3.50 - 3.60 | 8.0 Mohs | 1.607 - 1.627 | Topaz |
| Topazolite | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.880 - 1.940 | Garnet |
| Tourmaline | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.603 - 1.655 | Tourmaline |
| Tsavorite | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.739 - 1.744 | Garnet |
| Turquoise | 2.60 - 2.80 | 5.0 - 6.0 Mohs | 1.610 - 1.650 | Turquoise |
| Uvarovite | 3.50 - 4.30 | 6.5 - 7.5 Mohs | 1.740 - 1.870 | Garnet |
| Verdilite | 3.03 - 3.25 | 7.0 - 7.5 Mohs | 1.612 - 1.638 | Tourmaline |
| Water Opal | 1.98 - 2.25 | 5.5 - 6.5 Mohs | 1.440 - 1.460 | Opal |
| White Opal | 1.98 - 2.25 | 5.5 - 6.5 Mohs | 1.440 - 1.460 | Opal |
| Zircon | 4.60 - 4.70 | 7.5 Mohs | 1.777 - 1.987 | Zircon |
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