ents himself with relating what others believe in
this regard.

Both the Hebrew scriptures and the New Testament afford many references
to gems with which the eager student of the subject should be familiar.
"She is more precious than rubies" (referring to wisdom) is but one of
these.

In conclusion the author hopes that this little text may lead a few to
pursue further this most fascinating theme and that the pursuit may
bring much of pleasure as well as of profit.

INDEX

Absorption, 15

Adamantine luster, 40, 41

Agate, 128, 138, 172, 197

Alexandrite, 140

Almandite (_see_ Garnet)

Altered stones, 247-249, 250-257

Amazonite, 176

Amethyst, 94, 170, 195, 196

Aquamarine, 143, 189

Azurite, 132, 148, 177, 199

Balances, Care and use of, 283-293

Beryl, 84, 143, 190

Bibliography, 301

Bloodstone, 172

Blue diamonds, 91

Blue-white diamonds, 91

Brazilian diamonds, 182

Brilliancy, 203

Brilliant cut stones, 233

Brilliant, Theory of the, 205

Brittleness of gems, 119

Brown stones, 95

Bubbles in gems, 103

Bubbles in glass, 81

Bubbles in scientific stones, 103

Burmah rubies, 154

Cabochons, 45, 216, 227

Carbon, 136

Carborundum, 54, 55, 56

Carnelian, 128, 138, 172

Cat's-eye, 44-46, 138, 171

Chalcedony, 138

Chrysoberyl, 45, 85, 122, 140, 157, 188

Chrysoberyl cat's-eye, 45, 46, 85, 188

Chrysolite, 176

"Cinnamon stone," 144

Citrine quartz, 161, 171, 195, 196

Cleaving of diamonds, 208

Cleaving of precious stones, 213

Color, cause of, in minerals, 15

Color of gems, 66-92

Colorless stones, 97

Corundum gems, 68-70, 73, 101, 121, 134, 137

Corundum gems, defects of, 101

Cultured pearls, 277-279

Cutting of diamonds, 209

Cutting of precious stones, 201-226

Demantoid garnet, 62, 64, 82, 130, 144, 169, 193

Density of minerals, 23

Diamonds, 61, 73, 91, 120, 134, 151-153, 179-186

Dichroism, 15-22, 113

Dichroscope, the, 17-20

Dispersion, 60-65

Double refraction, 5

Doublets, 41, 241-246

Emerald, 75-82, 143, 164, 189

Emerald, wearing qualities of, 109

Epidote, 9

Extraordinary ray, 16

Fancy diamonds, 91, 151

"Fire," cause of, 207

Forms of precious stones, 227-236

Garnet, 69, 82, 96, 130, 143, 144, 167-170, 192-194

Garnet, Almandite, 143, 168, 193

Garnet, Andradite, 82, 130, 144, 169, 193

Garnet, Demantoid,