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Black opal -
163
pearl -
216,220
Blue ground - - - - 83
Blood stone - - 153,188
Blue-John
187
Bombay pearl - - - - 215
Bone turquois - - - 170
Borneo, diamond fields of - - 85
Bort ----- 68
Bowenite ----- 196
Braganza diamond - - - 83, 121
Brazil, agate of - - - - 154
amethyst of
145
andalusite of ...
124
chrysoberyl of - - - 106
diamond fields of - - - 75
euclase of
104
rock crystal of
143
topaz of - - - - 121
Brazilian chrysoberyl - - - 106
chrysolite - - 111
diamond - - - 142
emerald - - - 111
sapphire ...
111
Brilliant, double
46
form of - - - - 44
mixed -
45
sizes of - - - - 51
Briolette -
46
British Guiana diamond fields - 86
Bronzite
169
Burmah, jade of
165
ruby of -
89
Button pearls -
213
Cabochon cut ... 46
Cacholong - - - - 160
Caesium beryl - - - 103
Cairngorm stone - - - 147
Calcite
204
California, diamonds of - - 87
tourmaline of - - - 116
Callainite - - - - 174
Cape chrysolite - - - 193
Cape ruby - - - - 129
Carat defined ... 50
Carbonado - - - 68 25
