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Engraved pastes, 68 Epidote, 271 Essence d'Orient, 75 Essonite, 245 Euclase, 270 Eyed Agate, 169
F.
Face, crystal, 46 Fallow Topaz, 267 False Emerald, 131 Sapphire, 145 Topaz, 131 Feil, the strass of, 71 Felspar, 209 Feminine Lazurite, 241
Ruby, 184
Sapphire, 184 Fire Marble, 207
Opal, 180 Flame Opal, 178 Flaws, effect of, 54, 75 Flèches d'amour, 157 Flies in Amber, 288 Flint, 174
Fluorescence, 31, 142 Fluor Spar, 141 Form, crystal, 46 Formation of gems, early theories,
7 Fortification Agate, 169 Fracture, 41 Fusibility, 34
G.
Garnet, 243
Adelaide Ruby, 249 Almandine, 248 Andradite, 249
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Garnet,
Arizona Ruby, 248 Black, 249 Bohemian, 246 Cape Ruby, 247 Ceylonese
Ruby, 249 Colorado Ruby, 248 Common, 248, 249 Demantoid, 249 Elic Ruby,
247 Hessonite, 245 Oriental, 248 Precious, 246, 248 Pyrope, 246
Rhodolite, 250 Rock Ruby, 246 " shells," 251 Spessartite, 249 "
Syrian," 249 Topazolite, 250 Uvarovite, 250 Vermeille, 246, 248
Gems, early use of, 1
Gem-cutting, early, 50
Genesis of precious stones, 9
Gibraltar Stone, 207
Girasol, 180, 181
(Adularia), 211 Opal, 180
Girdle, 53
Glass for imitation gems, 71, 73
Goleonda Diamond mines, 111
Gold Opal, 178
Golden Beryl, 229
Gooseberry Stone, 246
Goutte d'e Suif, 56
Gouttes d'Eau, 267
Granite, gems in, 19
Grenat, 243
See also Zircon, 259
Gurgulho, 115
Gypsum, 286
origin of, 10, 15
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