BECAUSE of the rapid increase in knowledge about precious stones on the part of the buying public, it has become necessary for the gem merchant and his clerks and salesmen to know at least as much about the subject of gemology as their better informed customers are likely to know. 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) [xii]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) [xiii]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 The product will be sent by email/download within 48 hrs from receipt of your order. Please, whitelist the following e-mail: [email protected].

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