Blue gemstones
Hardness. Specific Gravity.
Beryl 7-3/4 2.709-2.810
Diamond 10 3.502-3.564
Dichorite (Water Sapphire) 7-7-1/2 4.049-4.060
Disthene (Kyanite) 5-7 3.609-3.688
Iolite (Cordierite) 7-1/4 2.641
Lapis lazuli 5-1/2 2.461
Sapphire 9 4.049-4.060
Topaz 8 3.500-3.520
Tourmaline 7-1/4 3.160
Turquoise 6 2.800
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