622 



IxNDEX 



Icelandic agate (obsidian), 448 



Icy flakes, 80, 93 



Idar,'' cutting works at, 518 



Idiochromatic, 55 



Idocrase, 410 



Illicit diamond buyers, 216 



Ilmenite, 534 



Imitations in glass, 97 



pearls, 600 



Imperial diamond, 254 



yu-stone, 503 



Inca-stone, 532 



Index of refraction, 38 



India, 140, 248, 277, 288, 304, 

 317, 323, 339, 344, 354, 372, 

 407, 415, 464, 477, 484, 488, 

 492, 498, 501, 503, 506, 507, 

 509, sio, sii, 516, 533, 595 

 — see also Ceylon 



Indian cut, yy, 239 



pearls, 595 



setting, 90 



topaz, 331, 339 



topaz (quartz), 487 



type of dianaond crystal, 



122 



Ocean, 596, 610, 615 



Indicators, specific gravity, 22 



Indicolite, 366, 372 



Indigo-sapphire, 283 



Indigolite, 372 



Ingegno, 611 



Inky sapphire, 283 



Intaglio, 86, 521 



lolite, 408 



Ireland, 139, 323, 386, 485, 532, 



599 

 Iridescence, 63 

 Iridescent quartz, 490 

 Iris, 90, 490 



Irish diamonds (quartz), 479 

 Iron-pyrites, 532 

 Iserine, 534 

 Isis nobOe, 601 

 Isleof Wight diamonds (quartz), 



479 



Isomorphism, 345, 364 



Isotropic, 46 



Itacolumite, 160, 167 



Italy, 299, 352, 362, 369, 371, 

 406, 411, 419, 436, 444, 445, 

 448, 453, 454, 460, 468, 477, 

 SOI, 503, 508, 533, 555, 609, 

 613 



Jacinth, 340 

 Jade, 458, 465 

 Jadeite, 457, 465 

 Jagdalak (Afghanistan), ruby, 

 277 



Jagersfontein diamond mine, 



182, 208, 212 

 Jais = jet, 556 

 Japan, 340, 489, 509 

 Jargon, jargoon, 342 

 Jasp-agate, 501, 512 

 Jaspe fleure, 501 

 Jasper, 499 



oriental (heliotrope), 511 



opal, 385 



Jet, 556 



Jewellery, diamond in, 238 



Jewels, 71 



Jolly's spring-balance, 19 



Jour (a) setting, 89 



Jubilee diamond, 254 



Julius Pam diamond, 210 



Kalmuck-agate, 388 



opal, 388 



Kamariga (India), diamond, 152 



Karmusirgut, 334. 



Karnul (India), diamond, 147 



■ series, 141 



Karoo formation, 187 

 Kascholong, 388 

 Kaschtschilon 388 

 Kashmir, sapphire, 288 

 Kawakawa, 465 

 Kidney -iron-ore, 533 



■■ -stone, 458, 466 



Kimberley (S. Africa), diamond, 



182, 187 

 diamond mine, 182, 187, 



197, 206, 212 



Mining Board, 201 



Kimberlite, 196 



King's coral, 615 



Klipdrift (S. Africa), diamond, 



180, 184 

 Kluge's classification, 108 

 Knibbel (amber), 550 

 Koffyfontein diamond mine, 



182, 208 

 Koh-i-noor diamond, 75, 153, 



248 

 Kollin garnets, 356 

 Kollur (India), diamond, 148 

 Kumst-coloured amber, 537 

 Kyanite, 413 

 Kyauk-tsein, 469 



La Pellegrina pearl, 592 

 Labrador, 432, 451 



-felspar, 432 



hornblende, 451 



spar, 432 



Labradorescence, 63, 433 

 Labradorescent felspar, 431 



Labradorite, 432 



Lake George diamonds (quartz), 



478 

 Landak (Borneo), diamond, 2 1 8 

 Landscape-agate, 5 1 2 

 Lap for grinding and polishing, 



82 

 Lapis-lazuli, 438 



false, 524 



oriental, 438 



Lapland, diamond, 231 

 Lathe, working stones on, 85 

 Lava, 446 

 Lavra, 168 

 Lazulite, 403 

 Lechosos-opal, 382 

 Lepidolite, 457 

 Leuco-garnet, 348 



-sapphire, 264, 282, 292 



Light — see Optical characters 

 Lilac-coloured stones, 570,580 

 Lincotius' rule, 105 

 Lintonite, 422 

 Liquids, heavy — see Heavy 



liquids 

 Lithia-emerald, 455 



-mica, 457 



Lohlbach agate, 500 

 Loodwins, 272 

 Lumpy cut, 71 



stones, 239 



Lustre, 35 



degrees of intensity of, 35 



kinds of, 36 



of pearls, 589 



Lynx-sapphire, 283 



(cordierite), 408 



-stone (cordierite), 408 



Macassar shells, 596 



Mackel (diamond), 209 



Macles (diamond), 209 



Madagascar, 291, 477, 489 



Magnetic characters, 67, 565 



Maiden-pearls, 589 



Maigama (India), diamond, 152 



Main reef, 191 



Mainz flux, 98 



Majgoha (India), diamond, 152 



Malachite, 524 



Malave, 287 



Malavilly (India), diamond, 149 



Maltese cross, yy 



Mamusa (S. Africa), diamond, 



183 

 Manelles, 547 

 Manganese-spar, 457 

 Mangelin, 105 

 Marble, 527 

 Marcasite, 532 



