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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
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PAGE
Diamond, combustibility of - 66
crystal form of - - 67
cutting of
47
Dresden Green - - - 68
Excelsior -
83.
Florentine - - - -68,74
Great Mogul
74
hardness of - - - 69
Hope Blue
68
of India -
71
Jubilee .... 83
Kohinoor - - - - 72
Lake George - - - 142
luster of - - - - 68
Matura
109
mining of - - - - 77
of United States - - 86
of Ural Mountains - - - 85
origin in Brazil - 80
origin in South Africa - - 84
Orloff .... 73
Pitt..... 72
Regent .... 72
Sancy - - - - 74
slaves'
120
sorting of - - -11,82
South African
80
specific gravity of - - - 69
Tiffany -
83
Victoria
83
Dichroism .... 31
Dichroite - - - - 136
Dichroscope ... 33
Diopside ....
169
Dioptase
200
Dispersion - - - - 27
Dispersive power ... 27
Disthene - - - - 123
Distortion of crystals - - 37
Distribution of gems - - - 7
Dodecahedron - - - 40
Double brilliant - - - 46
Double refraction
29
Doublets - - - - 56
Dresden Green diamond - - 68
Effect of heat on color of gems - 14
Emerald
98, 99,158
confused with jade - - - 101
Enstatite
169
Epidote..... 134
Eruptive rocks ... 6
Essonite - - - - 127
Euclase
104
Euxenite ....
140
Excelsior diamond - - 83
!6
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