Gemstone |
Specific Gravity |
Mohs Hardness |
Refractive Index |
Family |
Lapis Lazuli |
2.70 - 2.90 |
5.0 - 5.5 |
1.500 - 1.550 |
Lapis Lazuli |
Morganite |
2.63 - 2.91 |
7.5 - 8.0 |
1.585 - 1.594 |
Beryl |
Nephrite |
2.90 - 3.10 |
6.0 |
1.600 - 1.641 |
Jade |
Onyx |
2.65 |
7.0 |
1.531 - 1.539 |
Quartz |
Opal |
1.98 - 2.25 |
5.5 - 6.5 |
1.440 - 1.460 |
Opal |
Peridot |
3.22 - 3.45 |
7.0 |
1.635 - 1.690 |
Peridot |
Pyrope |
3.50 - 4.30 |
6.5 - 7.5 |
1.730 - 1.760 |
Garnet |
Quartz |
2.65 |
7.0 |
1.544 - 1.553 |
Quartz |
Rainbow Moonstone |
2.55 - 2.76 |
6.0 - 6.5 |
1.518 - 1.526 |
Feldspar |
Red Beryl |
2.63 - 2.91 |
7.5 - 8.0 |
1.570 - 1.598 |
Beryl |
Rhodolite |
3.50 - 4.30 |
6.5 - 7.5 |
1.740 - 1.770 |
Garnet |
Rock Crystal |
2.65 |
7.0 |
2.000 |
Quartz |
Rose Quartz |
2.65 |
7.0 |
1.540 - 1.550 |
Quartz |
Rubellite |
3.03 - 3.25 |
7.0 - 7.5 |
1.610 - 1.640 |
Tourmaline |
Ruby |
3.96 - 4.05 |
9.0 |
1.757 - 1.779 |
Corundum |
Sapphire |
3.96 - 4.05 |
9.0 |
1.757 - 1.779 |
Corundum |
Smoky Quartz |
2.65 |
7.0 |
1.540 - 1.550 |
Quartz |
Spessartine |
3.50 - 4.30 |
6.5 - 7.5 |
1.790 - 1.810 |
Garnet |
Spinel |
3.58 - 4.06 |
8.0 |
1.712 - 1.7 |
Spinel |
Sunstone |
2.55 - 2.76 |
6.0 - 6.5 |
1.560 - 1.572 |
Feldspar |
Topaz |
3.50 - 3.60 |
8.0 |
1.607 - 1.627 |
Topaz |
Tourmaline |
3.03 - 3.25 |
7.0 - 7.5 |
1.603 - 1.655 |
Tourmaline |
Tsavorite |
3.50 - 4.30 |
6.5 - 7.5 |
1.739 - 1.744 |
Garnet |
Turquoise |
2.60 - 2.80 |
5.0 - 6.0 |
1.610 - 1.650 |
Turquoise |
Uvarovite |
3.50 - 4.30 |
6.5 - 7.5 |
1.740 - 1.870 |
Garnet |
Verdilite |
3.03 - 3.25 |
7.0 - 7.5 |
1.612-1.638 |
Tourmaline |
White Opal |
1.98 - 2.25 |
5.5 - 6.5 |
1.440 - 1.460 |
Opal |
Zircon |
4.60 - 4.70 |
7.5 |
1.777 - 1.987 |
Zircon |
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