A Text-book Of Precious Stones For Jewelers And The Gem-loving Public

A Text-book Of Precious Stones For Jewelers And The Gem-loving Public

In this little text-book the author has tried to combine the trade information which he has gained in his avocation, the study of precious stones, with the scientific knowledge bearing thereon, which his vocation, the teaching of chemistry, has compelled him to master. In planning and in writing the book, every effort has been made to teach the fundamental principles and methods in use for identifying precious stones, in as natural an order as possible. This has been done in the belief that the necessary information will thus be much more readily acquired by the busy gem merchant or jeweler than would nave been the case had the material been arranged in the usual systematic order. The latter is of advantage for quick reference after the fundamentals of the subject have been mastered.

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Table of Contents:

Copyright

PREFACE

INTRODUCTION

CONTENTS

LESSON I HOW STONES ARE DISTINGUISHED FROM ONE ANOTHER

LESSON II REFRACTION

LESSON III DOUBLE REFRACTION

LESSON IV ABSORPTION AND DICHROISM

LESSON V SPECIFIC GRA.VITY

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

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