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PRECIOUS STONESby FRANK B. WADEFOR JEWELERS and THE GEM-LOVING PUBLIC
PREFACE
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 have 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. It is hoped, however, that the method of presentation used[iv] in this book will make easy the acquisition of a knowledge of gemology and that many who have been deterred from studying the subject by a feeling that the difficulties due to their lack of scientific training were insurmountable, will find that they can learn all the science that is really necessary, as they proceed. To that end the discussions have been given in as untechnical language as possible and homely illustrations have in many cases been provided.
Nearly every portion of the subject that a gem merchant needs to know has been considered and there is provided for the interested public much material which will enable them to be more intelligent purchasers of gem-set jewelry, as well as more appreciative lovers of Nature's wonderful mineral masterpieces.
1916
CONTENTS
I.- HOW STONES ARE DISTINGUISHED FROM ONE ANOTHER
II.- REFRACTION
III.- DOUBLE REFRACTION
IV.- ABSORPTION AND DICHROISM
V.- SPECIFIC GRAVITY
VI.- SPECIFIC GRAVITY DETERMINATIONS
VII.- LUSTER AND OTHER REFLECTION EFFECTS
VIII.- HARDNESS
IX.- HARDNESS (Continued)
X.- DISPERSION
XI.- COLOR
XII.- COLOR (Continued)
XIII.- COLOR (Continued)
XIV.- COLOR (Concluded)
XV.- HOW TO TELL SCIENTIFIC STONES FROM NATURAL GEMS
XVI.- HOW TO TEST AN "UNKNOWN" GEM
XVII.- SUITABILITY OF STONES FOR VARIOUS TYPES OF JEWELS, AS DETERMINED BY HARDNESS, BRITTLENESS, AND CLEAVABILITY
XVIII.- MINERAL SPECIES TO WHICH THE VARIOUS GEMS BELONG AND THE CHEMICAL COMPOSITION THEREOF
XIX.- THE NAMING OF PRECIOUS STONES
XX.- THE NAMING OF PRECIOUS STONES (Concluded)
XXI.- WHERE PRECIOUS STONES ARE FOUND
XXII.- HOW ROUGH PRECIOUS STONES ARE CUT
XXIII.- HOW ROUGH PRECIOUS STONES ARE CUT AND WHAT CONSTITUTES GOOD "MAKE" (Concluded)
XXIV.- FORMS GIVEN TO PRECIOUS STONES
XXV.- IMITATIONS OF PRECIOUS STONES
XXVI.- ALTERATION OF THE COLOR OF PRECIOUS STONES
XXVII.- PEARLS
XXVIII.- CULTURED PEARLS AND IMITATIONS OF PEARLS
XXIX.- THE USE OF BALANCES AND THE UNIT OF WEIGHT IN USE FOR PRECIOUS STONES
XXX.- TARIFF LAWS ON PRECIOUS AND IMITATION STONES
BIBLIOGRAPHY
INDEX
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