INDEX 



621 



Fish-eye, 429 

 Flame-opal, 375 

 Fleches d'amour, 489 

 Fleur de pecher diamond, 135 

 Fleurus diamonds (quartz), 479 

 Fliessen (amber), 549 

 Flint, 472 

 Floating reef, 191 

 Flohmig amber, 537 

 Florentine diamond, 250 

 Fluor = fluor-spar, 528 

 Fluor-spar, 528 

 Fluorescence, 65, 530, 539 

 Fluorite, 528 



Foils, use of, in mounting, go 

 Formation (Brazilian diamond 



deposits), 161 

 Forms of cutting, 72 

 Forsterite, 404 

 Fortification-agate, 512 

 FossU resins, 535 



turquoise, 402 



Fossilised wood, 496 



Fracture, 28 



France, 291, 327, 343, 386, 387, 



402, 403, 413, 416, 445, 468, 



476, 485, 487, 490, SOI, 503, 



557, 610 

 Frangibility, 33 

 Frothy amber, 538 

 Fusibility, 66 



Gagat = jet, 556 



Gani Coulour (India), diamond, 



148 

 Garimpeiros, 169 

 Garnet, 345 



as grinding material, 84 



alamandine, 352 



Bohemian, 356 



demantoid, 361 



group, 345 



hessonite, 350 



hyacinth-, 351 



leuco-, 348 



pyrope, 356 



rhodolite, 360 



shells, yg, 349, 353 



spessartite, 352 



Syrian, 354 



— — vermeille, 354, 356 



Garnierite, 420 



Gedanite, 553 



Gem, essential characters of, i 



■ cutting, 242 



— gravels, 68 



— hardness, i, 31 



— • — -sands, 68 



— ■ washing, 69 



Gems (engraved stones), 86 



Geodes, 513 



Geographical distribution, 69 



German jasper, 500 



Germany, 291, 333, 343, 362, 

 371, 386, 387, 393, 410, 416, 

 422, 445, 452, 453, 460, 468, 

 477, 483, 488, 493, 496, 498, 

 500, 501, 503, 510, 513, 515, 

 518, 528, 529, 530, 531, 533, 



541, 554, 558, 598 

 Giojetto = black coral, 615 

 Girasol, 375, 384, 429, 600 



oriental, 284 



Girdle of a cut-stone, 73 

 Glass imitations, 97 



agate, 446 



opal, 385 



volcanic, 446 



Glassies (diamond), 213 

 Glassy stone with smoky cor- 

 ners (diamond), 135, 211 

 Glazier's diamond, 245 

 Glyptic art, 86 

 Golconda diamond mines, 148 

 Gold-opal, 375 



-quartz, 490 



Golden beryl, 324 



topaz (quartz), 487 



Gong-Gong (Vaal R.), diamond, 



185 

 Gooseberry-stone, 362 

 Goutte d'eau (topaz), 330 



de sang (spinel), 297 



de^suif, Tg 



Goyaz (Brazil), diamond, 171 

 Grain (unit of weight), 104 

 Grand Duke of Tuscany dia- 

 mond, 250 

 Grilo Mogol (Brazil), diamond, 



159, 166 

 Greasy lustre, 37 

 Great Mogul diamond, 248 



Southern Cross pearl, 592 



Table diamond, 150 



— — White diamond, 254 

 Grecken, 547 

 Greece, 423, 460, 468 

 Green stones, 575, 578 

 Greenish-blue stones, 567 

 Greenland, 355, 437 

 Grey stones, 572, 577 

 Greying the diamond, 243 

 Grinding, operation of, 80 



disc, 82 



■ material, 82 



Griqualandite, 494 

 Grossularite, 362 

 Ground-stone (amber), 549 

 Gupiarras, 163 

 Gurgulho, 163, 164 

 Gypsum, 528 



HEMATITE, 533 

 Hair-stone, 489 

 Half -brilliant, 75 



grounded cut stones, "jj 



Halphen red diamond, 135 

 Hardness, 29 



determination of, 30, 564 



scale of, 30 



table of, 33 



Harlequin-opal, 375 

 Haiiynite, 440, 445 

 Hawk's-eye, 494 

 Health-stone, 532 

 Heavy liquids, 20 



indicators, 22 



series of, 24 



Heliotrope, 511 



Hematite = haematite, 533 



Hemihedral crystals, 10 



Hemimorphic crystals, 364 



Hemimorphite, 423 



Hessonite, 350 



Hexagonal system, 10, 47, 51 



Hiddenite, 455 



Hira Khund (India), diamond, 



150 

 Hmyaudwins, 272 

 Holland, 541 

 Holohedral crystals, 10 

 Honduras, 380, 385, 386 

 Hope blue diamond, 135,251 



pearl, 591, 594 



Hopetown (S. Africa), diamond, 



180 

 Hornblende = amphibole, 451 

 Labrador (hypersthene), 



451 

 Hornstone, 496 

 Horse-corals, 547 

 Hungarian cat's-eye, 493 



opal, 377 



Hungary, 291, 377, 386, 387, 



446, 448, 477, 485, 487, 498, 



506 

 Hyacinth, 340 



Compostela (quartz), 345 



garnet, 351 



(hessonite), 350 



(idocrase), 412 



oriental (corundum), 294 



(quartz), 345 



(spinel), 297 



Hyalite, 385 

 Hydrophane, 387 

 Hydrostatic balance, 13 

 Hypersthene, 451 



I.D.B, (illicit diamond buyers, 



216 

 Iceland, 386, 387, 388, 448, 506 



