  | | PAGE | | I. | Gem-Stones (in colour) | Frontispiece | | II. | Refractive Index Diagram | 36 | | III. | Interference Figures | 48 | | IV. | Jewellery Designs | 62 | | V. | Jewellery Designs | 88 | | VI. | Appliances used for Polishing Diamonds | 102 | | VII. | Polishing Diamonds | 103 | | VIII. | Slitting and Polishing Coloured Stones | 104 | | IX. | Faceting Machine | 105 | | X. | Lapidary’s Workshop and Office in England | 106 | | XI. | Lapidary’s Workshop in Russia | 107 | | XII. | French Family Cutting Stones | 108 | | XIII. | Indian Lapidary | 109 | | XIV. | Blowpipe used for the Manufacture of Rubies and Sapphires | 118 | | XV. | Kimberley Mine, 1871 | 140 | | XVI. | Kimberley Mine, 1872 | 141 | | XVII. | Kimberley Mine, 1874 | 142 | | XVIII. | Kimberley Mine, 1881 | 143 | | XIX. | Kimberley Mine at the Present Day | 144 | | XX. | Wesselton (open) Mine | 145 | | XXI. | Loading the Blue Ground on the Floors, and Ploughing it over | 146 | | XXII. | Washing-Machines for Concentrating the Blue Ground | 147 | | XXIII. | Diamond-Sorting Machines | 148 | | XXIV. | Kafirs Picking out Diamonds | 149 | | XXV. | Cullinan Diamond (natural size) | 168 | | XXVI. | Large Aquamarine Crystal (one-sixth natural size), Found at Marambaya, Minas Geraes, Brazil | 196 | | XXVII. | Gem-Stones (in colour) | 226 | | XXVIII. | Opal Mines, White Cliffs, New South Wales | 252 | | XXIX. | Gem-Stones (in colour) | 256 | | XXX. | Natives Drilling Pearls | 294 | | XXXI. | Metal Figures of Buddha Inserted in a Pearl-Oyster | 296 | | XXXII. | |   |
|
