Map on lining papers.

Includes bibliographical references (page 285) and index.

Gemstones and Their Influence 8 -- Nomenclature of Gemstones 12 -- Origin and Structure of Gemstones 14 -- Crystal Systems 17 -- Properties of Gemstones 20 -- Hardness 20 -- Cleavage and Fracture 24 -- Density and Specific Gravity 25 -- Weights Used in the Gem Trade 30 -- Optical Properties 31 -- Inclusions 58 -- Deposits and Production of Gemstones 61 -- Types of Deposits 62 -- Mining Methods 64 -- Cutting and Polishing of Gems 68 -- Engraving on Stones 69 -- Cutting and Polishing Agate 70 -- Cutting and Polishing Colored Stones Cabochon Cutting 71 -- Faceting 72 -- Ball Cutting 74 -- Cylinder Cutting 75 -- Drilling Gemstones 76 -- Cutting and Polishing Diamond 77 -- Types and Forms of Cut 79 -- Classifications of Gemstones 82 -- Value of Gemstones 85 -- Description of Gemstones 85 -- Best-Known Gemstones 86 -- Diamond 86 -- Corundum Species 98 -- Beryl Species 106 -- Chrysoberyl 114 -- Spinel 116 -- Topaz 118 -- Garnet Group 120 -- Zircon 124 -- Tourmaline Group 126 -- Spodumene Species 130 -- Quartz 132 -- Opal Species 166 -- Jade (Jadeite and Nephrite) 170 -- Peridot 174 -- Zoisite Species 176 -- Hematite 178 -- Pyrite 178 -- Feldspar Group 180 -- Rhodochrosite 184 -- Rhodonite 184 -- Turquoise 186 -- Lapis Lazuli 188 -- Sodalite 190 -- Azurite 190 -- Malachite 192 -- Lesser-Known Gemstones 194 -- Gemstones for Collectors 220 -- Rocks as Gemstones 244 -- Organic Gemstones 250 -- New on the Market 266 -- Imitation and Synthetic Gemstones 268 -- Symbolic and Beneficial Gemstones 275.