Balance, Jolly, 28.
„ Westphal, 24. Balas ruby, 116, 117. Ball, V., 74, 78. Ballas, 69, 92. Barrington Brown, 136. Basalt, 6.
Beck's method, 33, 34. Benitoite, 155-156. Beryl, 6, 7, 8, 12, 13, 14, 19, 108, 124, 128, 136; physical properties,
122; uses, 122-123; grades, 123; occurrence, 124; emeralds in
Mewar,
124-125; industry, 125-126. -Bipyramids, 15. Bloodstone, 143. Bort or
Bortz, 53, 69, 70, 92. Boule, 60, 61, 62. Braganza diamond, 98.
Brilliancy of gems, 4, 18, 33, 43, 44. Brilliant cut, 42, 44, 45, 47,
85, 86, 105, 139.
„ modification of, 45.
Brillianteerer, 52. Brilliants, 69, 85, 86. Bronzite, 156.
Burma Ruby Mines Co., 9, 111. *Byon', 107, 108, 112, 113, 125.
C
Cabochon,
42, 105, 120, 139, 141, 143, 146, 154. Cabochon cuts—convex, lentil,
high, etc., 41-42. Cairngorm, 142. Carat weight, 45, 48, 55, 65.
„ international, 56.
Carbonado,
69. Carbonates, 11. Carbuncle, 103, 131. Carnelian, 141, 142, 144, 145.
Cassiterite, 11, 156. Cathode rays, 18. Cat's eye, 119, 120, 121, 141,
142. Celebrated rubies, 115-116. Centre of symmetry, 14.
Chemical composition, classification and formulae of chief gem-stones, 10-12.
176
