Gemstones of the World: Newly Revised Fifth Edition

Overview

Gemstones of the World, the definitive guide to gems for over 20 years, takes the mystery out of appreciating, buying, and selling all kinds. It covers everything from the romance and history of more than 1,400 gemstones to their geographic locations; scientific, physical, and color properties; and the way they are formed, structured, and mined. With many charts and diagrams, Schumann offers full coverage of the optical features of gems - light and color, luminescence, refraction, and inclusions - and about ...
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Overview

Gemstones of the World, the definitive guide to gems for over 20 years, takes the mystery out of appreciating, buying, and selling all kinds. It covers everything from the romance and history of more than 1,400 gemstones to their geographic locations; scientific, physical, and color properties; and the way they are formed, structured, and mined. With many charts and diagrams, Schumann offers full coverage of the optical features of gems - light and color, luminescence, refraction, and inclusions - and about densities and the chemical elements of each stone, with fascinating details on different cuts, polishing, synthetic and imitation gems, hardness, cleavage, classification, trade names, rarity, and much more - all with an easy-to-understand text. And then there are the magnificent photographs of the stones themselves in brilliant full-color, with full data on the facing page. If you wanted only one book on gemstones in your library, this would be the one!
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Editorial Reviews

Jean Campbell
Every bead worker should have this book. It offers 1,500 full-color photos of precious and semiprecious stones, and gem cutting and mining processes; also provides chemical origin, nomenclature, and property information.
Beadwork
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Product Details

  • ISBN-13: 9781454909538
  • Publisher: Sterling
  • Publication date: 7/2/2013
  • Edition description: Fifth Edition
  • Edition number: 5
  • Pages: 272
  • Sales rank: 61,852
  • Product dimensions: 5.30 (w) x 7.70 (h) x 1.00 (d)

Table of Contents


Preface     7
Introduction     8
Gemstones and Their Influence     8
Terminology     10
The 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
Color     31
Color of Streak     32
Changes in Color     32
Refraction of Light     36
Double Refraction     40
Dispersion     41
Absorption Spectra     44
Transparency     48
Luster     48
Pleochroism     49
Light and Color Effects     52
Luminescence     55
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
Types of Cut     79
Forms of Cut     80
Classifications of Gemstones     82
Scientific Classification     82
Commercial Classifications     84
Value of Gemstones     85
Description of Gemstones     85
Best-Known Gemstones     86
Diamond     86
Diamond Occurrences     88
Diamond Production     89
Diamond Trade     90
Valuation of Diamonds     91
Famous Diamonds     94
Development of the Brilliant Cut     96
Corundum Species     98
Ruby     98
Sapphire     102
Beryl Species     106
Emerald     106
Aquamarine     110
Precious Beryl     112
Chrysoberyl     114
Spinel     116
Topaz     118
Garnet Group     120
Pyrope     120
Almandite     120
Spessartite     120
Grossularite     122
Andradite     122
Uvarovite     122
Zircon     124
Tourmaline Group     126
Spodumene Species     130
Hiddenite     130
Kunzite     130
Quartz     132
Rock Crystal     132
Smoky Quartz     132
Amethyst     134
Amethyst Quartz     134
Citrine     136
Prasiolite     136
Rose Quartz     138
Aventurine     138
Prase     138
Blue Quartz     138
Quartz Cat's-Eye     140
Hawk's-Eye     140
Tiger's-Eye     140
Chalcedony     142
Carnelian     142
Sard     142
Chrysoprase     144
Bloodstone     144
Dendritic Agate     146
Moss Agate     146
Agate     148
Layer Stones     158
Jasper     162
Petrified Wood      164
Opal Species     166
Precious Opal     166
Fire Opal     168
Common Opal     168
Jade (Jadeite and Nephrite)     170
Jadeite Species     170
Nephrite     172
Peridot     174
Zoisite Species     176
Tanzanite     176
Thulite     176
Anyolite     176
Hematite     178
Pyrite     178
Feldspar Group     180
Amazonite     180
Moonstone     180
Orthoclase     180
Labradorite     182
Aventurine Feldspar     182
Rhodochrosite     184
Rhodonite     184
Turquoise     186
Lapis Lazuli     188
Sodalite     190
Azurite     190
Malachite     192
Lesser-Known Gemstones     194
Andalusite     194
Euclase     194
Hambergite     196
Iolite     196
Phenakite     196
Dumortierite     198
Danburite     198
Axinite      198
Benitoite     200
Cassiterite     200
Epidote     200
Idocrase     200
Sinhalite     202
Kornerupine     202
Prehnite     204
Petalite     204
Scapolite     204
Diopside     206
Beryllonite     206
Brazilianite     206
Amblygonite     208
Enstatite     208
Lazulite     208
Dioptase     210
Apatite     210
Sphene     210
Kyanite     212
Scheelite     212
Variscite     212
Fluorite     214
Hemimorphite     198
Smithsonite     214
Sphalerite     216
Cerussite     216
Chrysocolla     216
Serpentine     218
Stichtite     218
Ulexite     218
Tiger's-Eye Matrix     218
Gemstones for Collectors     220
Rocks as Gemstones     244
Onyx Marble     244
Mexican Onyx     244
Landscape Marble     244
Orbicular Diorite     246
Obsidian     246
Moldavite     246
Alabaster     248
Agalmatolite     248
Meerschaum     248
Fossils     248
Organic Gemstones     250
Coral     250
Jet     252
Cannel Coal     252
Ivory     252
Odontolite     252
Amber     254
Pearl     256
Operculum     265
Mother of Pearl     265
New on the Market     266
Verdite
Charoite
Eclogite
Gneiss
Unakite
Nuummite
Ammonite
Carletonite
Catapleiite
Larimar
Gaspeite
Sugilite
Imitation and Synthetic Gemstones     268
Imitations     268
Combined Stones     269
Synthetic Gemstones     269
Synthetic Gemstones Without a Natural Model     272
Genuineness Test for Gemstones     273
Genuineness for Diamond     273
Symbolic and Beneficial Gemstones     275
Cosmic-Astral Symbolic Stones     275
Medicinal Stones     279
Bibliography     285
Table of Constants     287
Index      304
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