| PAGE |
| Preface | [iii] |
| LESSON | |
| I.— | How Stones are Distinguished from One Another | [1] |
| II.— | Refraction | [4] |
| III.— | Double Refraction | [8] |
| IV.— | Absorption and Dichroism | [15] |
| V.— | Specific Gravity | [23] |
| VI.— | Specific Gravity Determinations | [31] |
| VII.— | Luster and Other Reflection Effects | [38] |
| VIII.— | Hardness | [47] |
| IX.— | Hardness (Continued) | [55] |
| X.— | Dispersion | [60] |
| XI.— | Color | [66] |
| XII.— | Color (Continued) | [75] |
| XIII.— | Color (Continued) | [87] |
| XIV.— | Color (Concluded) | [93] |
| XV.— | How to Tell Scientific Stones from Natural Gems | [99] |
| XVI.— | How to Test an "Unknown" Gem | [109] |
| XVII.— | Suitability of Stones for Various Types of Jewels, as Determined by Hardness, Brittleness, and Cleavability | [119] |
| XVIII.— | Mineral Species to which the Various Gems Belong and the Chemical Composition thereof | [133] |
| XIX.— | The Naming of Precious Stones | [149] |
| XX.— | The Naming of Precious Stones (Concluded) | [164] |
| XXI.— | Where Precious Stones are Found | [179] |
| XXII.— | How Rough Precious Stones are Cut | [201] |
| XXIII.— | How Rough Precious Stones are Cut and What Constitutes Good "Make" (Concluded) | [213] |
| XXIV.— | Forms Given to Precious Stones | [227] |
| XXV.— | Imitations of Precious Stones | [237] |
| XXVI.— | Alteration of the Color of Precious Stones | [250] |
| XXVII.— | Pearls | [258] |
| XXVIII.— | Cultured Pearls and Imitations of Pearls | [277] |
| XXIX.— | The Use of Balances and the Unit of Weight in Use for Precious Stones | [283] |
| XXX.— | Tariff Laws on Precious and Imitation Stones | [294] |
| Bibliography | [301] |
| Index | [313] |