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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.

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"

[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


Tags: gem

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Keywords: jewels;precious stones;refraction
File Size: 610 KBytes