PAGE
Carbuncle ... - 130
Carnelian ....
151
Carnelionyx .... 156
Cascalho ... 10, 75
Cat's-eye - - 106, 107, 148, 169
Ceylon, chrysoberyl of - - 106
essonite of - - - - 130
gem cutting in - - - 42
gem mining in - - - 8
pearl fisheries of - - 215
sapphire of - - - - 93
spinel of - - - - 96
zircon of
109
Ceylonese chrysolite - - 132
Ceylonite - - - - 96
Ceylon opal
178
Chalcedony
....
150
Chalcedonyx ... 156
Chalchihuitl - - - - 167
Chiastolite
124
Chlorastrolite - - - - 191
Chloromelanite - - - 165
Chrysolite - - - - 132
Chrysoberyl - - - 106
Chrysocolla - - - - 199
Chrysoprase ... 152
Cinnamon stone ...
127
Citrine
147
Colombia, emeralds of - - 100
Colors of gems ... 13
as seen with the dichroscope - 33
Coral
221
Cordierite - - - - 136
Corundum .... 88
Critical angle - - - 28
Crocidolite
149
Cryptocrystalline quartz - - 150
Crystal forms
37
Cube..... 39
Cutting of gems ... 41
Cyanite - - - - - 123
Cymophane - - - - 106, 107
Demantoid .... 130
Demidovite -
199
Derbyshire spar - - - 187
Dewey diamond ... 86
Diamond - - - - 66
artificial production of - - 87
Australian - - - - 85
Austrian Yellow -
74
Braganza
83, 121
Brazilian - - - 75,142
British Guiana - - 86
cleaning of
82
colors of - - - 68
226
