Gem-cutting and polishing, 41-55.
Gem-cutting, history of, 46-48.
Gem minerals, 7, 8, 9, 10, 12.
Gem mining, 1; Mogok, 108-109; Ceylon, 109; Kashmir, 109; Siam
111. Gemmology, 5, 12, Gem-stones, chemical composition of, 10-12.
„ how they occur and how they are won, 5-10.
„ qualifications of, 3-4.
„ under ultraviolet light, 17.
Genesis
of diamond, 72-74. Glass imitations, 18, 64-65. Gomeda, 136. Golconda,
74. Gold, 7, 9, 65; alloys, 65. Golden beryl, 124. Goniometers, 13.
Granite, 6. Graphite, 70. Greasy lustre, 17. Great Moghul diamond, 72,
96. Great Table of Tavernier, 98. Grossularite, 130, 131, 132. -Gypsum,
158.
H Haloids, 11.
Hannay's artificial diamonds, 60. Hardness, Moh's scale, 20. Hardness table, 166-167. Hauyne, 6.
Heat
treatment of gems, 57. Heavy liquids, 25, 27. Heliodor, 123.
Heliotrope, 143. Hemihedral, 14. Henri Polak, 42. Hessonite, 42.
Hexagonal system, 13-14. Hmaw sit sit, 148. Hmyawdwins, 112. Holohedral, 14. Hope Blue diamond, 46, 98, 100.
180
