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.
I.-HOW STONES ARE DISTINGUISHED FROM ONE ANOTHER
IV.-ABSORPTION AND DICHROISM
VI.-SPECIFIC GRAVITY DETERMINATIONS
VII.-LUSTER AND OTHER REFLECTION EFFECTS
[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
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
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58 VP (VersaPoints)
Commission Volume (CV): $0.78
Direct Commission (DC): $0.35
TC Executive Pool (EP): $0.31
Co-Sponsor Comm (CSC) $0.12
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