FOR JEWELERS and THE GEM-LOVING PUBLIC
CONTENTS
HOW STONES ARE DISTINGUISHED FROM ONE ANOTHER
REFRACTION
DOUBLE REFRACTION
SPECIFIC GRAVITY
ABSORPTION AND DICHROISM
SPECIFIC GRAVITY DETERMINATIONS
LUSTER AND OTHER REFLECTION EFFECTS
HARDNESS
DISPERSION
COLOR
HOW TO TEST AN "UNKNOWN" GEM
HOW TO TELL SCIENTIFIC STONES FROM NATURAL GEMS
SUITABILITY OF STONES FOR VARIOUS TYPES OF JEWELS, AS DETERMINED BY HARDNESS, BRITTLENESS, AND CLEAVABILITY
THE NAMING OF PRECIOUS STONES
THE NAMING OF PRECIOUS STONES (Concluded)
MINERAL SPECIES TO WHICH THE VARIOUS GEMS BELONG AND THE CHEMICAL COMPOSITION THEREOF
WHERE PRECIOUS STONES ARE FOUND
HOW ROUGH PRECIOUS STONES ARE CUT
HOW ROUGH PRECIOUS STONES ARE CUT AND WHAT CONSTITUTES GOOD "MAKE" (Concluded)
IMITATIONS OF PRECIOUS STONES
FORMS GIVEN TO PRECIOUS STONES
ALTERATION OF THE COLOR OF PRECIOUS STONES
PEARLS
THE USE OF BALANCES AND THE UNIT OF WEIGHT IN USE FOR PRECIOUS STONES
CULTURED PEARLS AND IMITATIONS OF PEARLS
TARIFF LAWS ON PRECIOUS AND IMITATION STONES