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Collet, 201
Colours of gems, 292, 293
Congo Emerald, 188
Copper, emerald-copper, 71
Coral, 102, 107
Coral Bank, Sicilian, 104
Coral, Fossil Coral, 107
Coral Industry in Italy, 104
Corallium rubrum, 103
Cordierite, 95
Corundum, 80,82,83, 88, 91,
92 Counterfeiting gems, 210 Costliest strand of pearls,
77, 78 Crocidolite, 134, 135 Crown of a cut gem, 200 Crown of the Moon (Taj-
e-Mah) Diamond, 244 Crystallography, 196 -- systems of crystal
form, 393 Culet, 201
Cullinan Diamond, 48-55 Curative attributes of gems,
235 Cymophane, 131 Czar of Russia's Emerald,
67
D
Days represented by gems,
232 De Beers diamond mines
and processes, 33, 37 Demantoids, 113, 152 Dendritic Agate (Tree
Stone), 178 Diamond, 23
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------Blue, 95
------Discovery of diamonds
in South Africa, 29
Diamond cutter, 195
Diamond Cutters' Manufacturers' Association, 259
Diamond Cutters' Trade Union, 253
Diamond-cutting, 195
Diamond-cutting industry in the United States, 260
Diamond mines of India, 26, 27
Diamond of Crete, 26
Diamond-sawing machines, 208
Diamond Syndicate, the London, 30, 39, 41, 43
Diamond Workers' Protective Union of America, 257
Dichroism, a list of leading twin-coloured gems, 294
Dichroitc, 189
Dingley tariff, 257
Diopside, 187, 189
Dioptase, 71, 188
Disk, 205
Dispersion, 24
Divination by stones, 232
Dop, 205, 206
------machine, or mechanical, 207
Doublets, 215
Dresden Green Diamond, 243
Duke of Devonshire's Emerald, 66
Dumortierite, 134
Duty on diamonds, 257
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