Black gemstones
Hardness. Specific Gravity.
Diamond 10 3.502-3.564 Garnet 6-1/2-7-1/2 3.400-4.500 Jet 3-1/2 1.348 Onyx (a variety of Chalcedony) 6-1/2 2.598-2.610 Quartz 7 2.670 Tourmaline (not unlike Black Resin in appearance) 7-1/4 3.024-3.300
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Violet gemstones Hardness. Specific Gravity. Amethyst 7 2.661 Diamond 10 3.502-3.564 Quartz (Amethyst) 7 2.670 Sapphire 9 4.049-4.060 Spinel 8 3.614-3.654 Tourmaline 7-1/4 3.160 |
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