Gemmologist's Compendium

By: Alan Jobbins, Robert Webster

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Hardcover | 1 May 1998 | Edition Number 7

At a Glance

Hardcover
240 Pages

Edition Type
Revised

Dimensions(cm)
14.0 x 20.6 x 2.7

Hardcover

$50.75

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This is the seventh edition of a book which has been for years the 'bible' of professional and amateur gemmologists, as well as retail jewellers. Originally written by Robert Webster, an expert who dedicated most of his life to the subject and who worked in the London Gem Testing Laboratory for twenty-five years, this edition has been completely revised and updated by E. Alan Jobbins, Keeper of Minerals and Gemstones at the Geological Museum in London for thirty-five years. The first part of the book is a comprehensive glossary on all aspects of gemstones and the terms associated with them. The second part includes sections on manufactured gems, the enhancement of gem materials and on the precautions necessary for avoiding damage to gemstones and jewellery during manufacturing, repairs and cleaning. There are comprehensive sets of tables of the physical constraints needed for gem testing, of the sources of gem materials and the cuts used to demonstrate their beauty. Fifteen pages of colour photographs will assist in the identification of inclusions and there are many useful conversion tables.

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Preface to Fifth Edition	p. 8
Preface to Seventh Edition	p. 9
Country Name Changes	p. 12
Alphabetical glossary of names and terms	p. 13
Absorption spectra	p. 148
Atomic bombardment of gemstones	p. 181
Artificial treatment of gemstones	p. 179
'Base' system for price of pearls	p. 221
Becke's method (SG)	p. 131
Brinell scale of hardness	p. 115
Chemical composition of gems and precious metals	p. 210
Chemical treatments	p. 181
Clarity Grading of Diamonds	p. 224
Cleavage	p. 114
Colour filters	p. 157
Colour grading, Comparison of schemes for diamond	p. 225
Colours of Gemstones	p. 159
Composite stones	p. 173
Conversion formulae	p. 231
Crystal systems	p. 111
Cuts for gemstones	p. 184
Damage to gemstones	p. 191
Density correction tables	p. 231
Diamond colour grading, Comparison of schemes for	p. 225
Disclosure of treatments	p. 184
Dispersion, Colour	p. 142
Elements, Chemical	p. 216
Elements, Periodic classification of	p. 217
Emission lines for calibration, Spectral	p. 156
Estimating weights of gemstones	p. 226
Flame test	p. 195
Fluorescence	p. 166
Fraunhofer lines, Major	p. 155
Gauges, Diamond and pearl	p. 226
Gemmological organizations	p. 239
Geological time scale	p. 220
Glass	p. 175
Greek alphabet	p. 236
Greek prefixes and their meanings	p. 236
Hardness	p. 114
Heat treatment of gemstones	p. 180
Imitation pearls	p. 176
Irradiation of gems	p. 181
Light spectrum	p. 155
Liquids for refractive index determination	p. 131
Manufactured gemstones	p. 169
Mercury spectrum	p. 156
Metric weights	p. 229
Minimum deviation (RI)	p. 130
Mohs's scale of hardness	p. 115
Occurrence of gemstones, by countries	p. 205
Occurrence of gemstones, by species	p. 197
Optical properties	p. 133
Pearls, Calculations for pricing	p. 221
Pearls, Damage to	p. 193
Pearls, Imitation	p. 176
Periodic classification of chemical elements	p. 217
Plastics	p. 178
Pleochroism	p. 144
Price of pearls, Calculations for	p. 221
Refractive index	p. 128
Refractive index and specific gravity, Relation between	p. 235
Snell's law	p. 128
Sources of further information	p. 238
Sources of gemstones, by countries	p. 205
Sources of gemstones, by species	p. 197
Specific gravity	p. 117
Staining of gemstones	p. 181
Streak tests	p. 195
Synthetic gemstones	p. 169
Temperature conversion tables	p. 230
Tests, miscellaneous	p. 196
Transparency of gemstones to X-rays	p. 165
Troy ounce, Subdivisions of	p. 228
Ultra-violet light, Fluorescent colours under	p. 166
Valency	p. 214
Weights, Metric	p. 229
Weights, Units of	p. 227
X-rays, Transparency of gemstones to	p. 165
Table of Contents provided by Blackwell. All Rights Reserved.

Gemmologist's Compendium

At a Glance

Hardcover

Shipping

How to return your order

Defective items

You Can Find This Book In

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