Table of Contents
I.— 
HOW STONES ARE DISTINGUISHED FROM ONE ANOTHER 
1 
II.— 
REFRACTION 
4 
III.— 
DOUBLE REFRACTION 
8 
IV.— 
ABSORPTION AND DICHROISM 
15 
V.— 
SPECIFIC GRAVITY 
23 
VI.— 
SPECIFIC GRAVITY DETERMINATIONS 
31 
VII.— 
LUSTER AND OTHER REFLECTION EFFECTS 
38 
VIII.— 
HARDNESS 
47 
IX.— 
HARDNESS (Continued) 
55 
X.— 
DISPERSION 
60 
XI.— 
COLOR 
66 
XII.— 
COLOR (Continued) 
75 
XIII.— 
COLOR (Continued) 
87 
XIV.— 
COLOR (Concluded) 
93 
[xii]XV.— 
HOW TO TELL SCIENTIFIC STONES FROM NATURAL GEMS 
99 
XVI.— 
HOW TO TEST AN 
109 
"UNKNOWN" GEM 
XVII.— 
SUITABILITY OF STONES FOR VARIOUS TYPES OF JEWELS, AS DETERMINED BY HARDNESS, BRITTLENESS, AND CLEAVABILITY 
119 
XVIII.— 
MINERAL SPECIES TO WHICH THE VARIOUS GEMS BELONG AND THE CHEMICAL COMPOSITION THEREOF 
133 
XIX.— 
THE NAMING OF PRECIOUS STONES 
149 
XX.— 
THE NAMING OF PRECIOUS STONES (Concluded) 
164 
XXI.— 
WHERE PRECIOUS STONES ARE FOUND 
179 
XXII.— 
HOW ROUGH PRECIOUS STONES ARE CUT 
201 
XXIII.— 
HOW ROUGH PRECIOUS STONES ARE CUT AND WHAT CONSTITUTES GOOD "MAKE" (Concluded) 
213 
[xiii]XXIV.— 
FORMS GIVEN TO PRECIOUS STONES 
227 
XXV.— 
IMITATIONS OF PRECIOUS STONES 
237 
XXVI.— 
ALTERATION OF THE COLOR OF PRECIOUS STONES 
250 
XXVII.— 
PEARLS 
258 
XXVIII.— 
CULTURED PEARLS AND IMITATIONS OF PEARLS 
277 
XXIX.— 
THE USE OF BALANCES AND THE UNIT OF WEIGHT IN USE FOR PRECIOUS STONES 
283 
XXX.— 
TARIFF LAWS ON PRECIOUS AND IMITATION STONES 
294