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Specific gravity of gem minerals, table, 297, 298
Spessartite, 114
Sphserulite, 191
Sphen, 193
Sphene, 193
Spinel, 88
------Pomegranate, 89
------Vinegar-Spinel, 133
Spodios, 156
Spodumene, 154
------Brazilian, 157
------unaltered, 155
Star of South Africa Diamond, 31, 241
Staurolite, 192
Stick, 206
Strass, 211
Style, 181
Styles of cutting, 199
Succinite, 113, 170
Succinum electrum, 170
Sulphur Stone, 191
Sunstone, 148, 150
Sun-turning, 173
Supernatural attributes of gems, 235
Τ
Tabasheer, 116
Table, 200
Tests of genuineness, 212
Thermo-luminescence, 159
Tiger-eye, 135
Titanite, 193
Topaz, 122
------Blue, 125
------Brazilian, 126
------False, 125
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------Indian, 125
------Oriental, 92, 125
------Rhombicus, 122
------Rose Pink, 124
------ Saxon, 125
------Scotch, 125
------Smoky, 125, 187
------Spanish, 125
------True, 123
Topazios, 122
Topazolite, 113
Tourmalines, 160
------black, 166
------red, 162
------twin-coloured, 162
Transparency of gems under Röntgen (X-) rays, 300
Tree Stone, 178
Triphane, 156
Triplets, 215
Tulp Straat, Amsterdam, 46
Türkis, 127
Turmali, 160
Turquoise, 127
------Matrix, 129
------Occidental, 130
Twelve Mazarins, the, 240
U
United States tariff on imported diamonds, 43
Universal Diamond Workers' Alliance, 258
Uvarovite, 114
V Valuation of gems, 22
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