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DISCRIMINATION OF PRECIOUS STONES.
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ORANGE AND YELLOW STONES.
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NAME. DENSITY. PLEOCHROISM. HARDNESS.
Cairngorm 2·66 Weak 7
Beryl 2·69 Strong 7¾
Tourmaline 3·11 ,, 7¼
Spodumene 3·20 Weak 6¾
Diamond 3·53 None 10
Topaz 3·53 Strong 8
Hessonite 3·66 None 7
Chrysoberyl 3·75 Strong 8½
Sapphire 4·00 Strong„ 9
Spessartite 4·15 None 7¼
Golden Zircon 4·40 Weak 7½
Yellow Zircon 4·67 Weak„ 7½
GREEN STONES.
NAME. DENSITY. PLEOCHROISM. HARDNESS.
Emerald 2·70 Strong 7½
Aquamarine 2·70 7¾
Jade 3·00 Distinct 6
Tourmaline 3·11 Strong 7¼
Hiddenite 3·15 Strong„ 6¾
Jadeite 3·32 Distinct 7
Diopside 3·34 Weak 6
Peridot 3·40 Strong 6½
Epidote 3·44 Strong„ 6½
Spinel 3·58 None 8
Alexandrite 3·65 Strong 8½
Demantoid 3·85 None 6
Sapphire 4·00 Strong 9
Zircon 4·05 Weak 7¼
