CONTENTS

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Frank Bertram Wade
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

A Text-Book of Precious Stones

                                                                                                                                                                                                                                                                                                           

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