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
(average)
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

PINK STONES.

_Hardness._ _Specific Gravity._
(See Chapter VII.) (See Chapter VIII.)
Beryl 7-3/4 2.709-2.810
Diamond 10 3.502-3.564
Ruby 9 4.073-4.080
Spinel 8 3.614-3.654
Topaz ("burnt" or "pinked"), see
Chapter XIV., page 92 8 3.500-3.520
Tourmaline 7-1/4 3.024

BLUE STONES.

_Hardness._ _Specific Gravity._
(See Chapter VII.) (See Chapter VIII.)
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

GREEN STONES.

_Hardness._