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PREFACE

INTRODUCTION

A Text-Book of Precious Stones

LESSON I

HOW STONES ARE DISTINGUISHED FROM ONE ANOTHER

LESSON II

REFRACTION

LESSON III

DOUBLE REFRACTION

LESSON IV

ABSORPTION AND DICHROISM

LESSON V

SPECIFIC GRAVITY

LESSON VI

SPECIFIC GRAVITY DETERMINATIONS

LESSON VII

LUSTER AND OTHER REFLECTION EFFECTS

LESSON VIII

HARDNESS

LESSON IX

HARDNESS— Continued

LESSON X

DISPERSION

LESSON XI

COLOR

LESSON XII

COLOR— Continued

LESSON XIII

COLOR— Continued

LESSON XIV

COLOR— Concluded

LESSON XV

HOW TO TELL SCIENTIFIC STONES FROM NATURAL GEMS

LESSON XVI

HOW TO TEST AN "UNKNOWN" GEM

LESSON XVII

SUITABILITY OF STONES FOR VARIOUS TYPES OF JEWELS, AS DETERMINED BY HARDNESS, BRITTLENESS, AND CLEAVABILITY

LESSON XVIII

MINERAL SPECIES TO WHICH THE VARIOUS GEMS BELONG AND THE CHEMICAL COMPOSITION THEREOF

LESSON XIX

THE NAMING OF PRECIOUS STONES

LESSON XX

THE NAMING OF PRECIOUS STONES (Concluded)

LESSON XXI

WHERE PRECIOUS STONES ARE FOUND

LESSON XXII

HOW ROUGH PRECIOUS STONES ARE CUT

LESSON XXIII

HOW ROUGH PRECIOUS STONES ARE CUT AND WHAT CONSTITUTES GOOD "MAKE"— Concluded

LESSON XXIV

FORMS GIVEN TO PRECIOUS STONES

LESSON XXV

IMITATIONS OF PRECIOUS STONES

LESSON XXVI

ALTERATION OF THE COLOR OF PRECIOUS STONES

LESSON XXVII

PEARLS

LESSON XXVIII

CULTURED PEARLS AND IMITATIONS OF PEARLS

LESSON XXIX

THE USE OF BALANCES AND THE UNIT OF WEIGHT IN USE FOR PRECIOUS STONES

LESSON XXX

TARIFF LAWS ON PRECIOUS AND IMITATION STONES

BIBLIOGRAPHY

INDEX