Red and rose gemstones
Hardness. Specific Gravity.
Carnelian (a variety of Chalcedony) 6-1/2 2.598-2.610
Diamond 10 3.502-3.564
Deep Red Garnet 7-1/4 3.40-4.50
Jasper 7 2.668
Opal (the “Fire Opal”) 5-1/2-6-1/2 2.21
Ruby 9 4.073-4.080
Rhodonite 5-1/2-6-1/2 3.413-3.617
Sapphire 9 4.049-4.060
Spinel Ruby 8 3.614-3.654
Topaz 8 3.500-3.520
Tourmaline 7-1/4 3.024
Zircon 7-1/2 4.70-4.88
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