Gemmology

Author: P. G. Read

Publisher: Elsevier

ISBN: 1483144674

Category: Nature

Page: 370

View: 9655

Gemmology is a text for students preparing for the Gemmological Association's Preliminary and Diploma examinations. The book is more expansive and up-to-date than the author's earlier book, Beginner's Guide to Gemmology. The book deals with the practical and theoretical sides of gemmology. Tracing the background and science of gemmology, the book covers the gem material, geological formation, and occurrence of gemstones on the earth. The composition of gemstones from the atoms, elements, molecules, and compounds comprising them is analyzed, and the relationship between chemical composition and durability of the stone is explained. The basics of crystallography is mentioned as a tool toward understanding gemmology after which cleavage, parting, and fracture are done. A gemstone's durability and hardness and how the latter influences engineering tests and the mining techniques are compared. An important test technique to identify unmounted stones is the measure of specific gravity using displacement measurement methods and hydrostatic methods. After more descriptive details are given in identification of gemstones, whether these are synthetic or simulants, through a comprehensive explanation of the materials found in these other gemstones, the fashioning, through shaping or polishing, of gemstones is explained. Emphasis is given on the critical angle in which light rays pass in different rock densities, and then the cutting styles, gemstone polishing, and grading are discussed. Students studying for the Gemmological Association's Preliminary and Diploma examinations, jewelers, lapidarists, and diamond cutters, as well as those engaged in the hobby of gemmology, will find this book helpful and full of information toward their endeavors and hobbies.
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Beginner's Guide to Gemmology

Author: Peter G Read

Publisher: Elsevier

ISBN: 1483183122

Category: Nature

Page: 240

View: 2583

Beginner's Guide to Gemmology presents the profiles of the principal gem materials. This book discusses the interesting characteristics of gemstones as the growing consumer market jewelry resulted in increased sales of gem testing instruments. Organized into 12 chapters, this book begins with an overview of the development of the science of gemmology. This text then explains the fundamental qualities necessary in a gem, including color, hardness, specific gravity, crystallography, refractive index, pleochroism, critical angle, luminescence, and absorption spectra. Other chapters consider the organic gem materials, including amber, ivory, coral, tortoiseshell, jet, ebony, and pearl. This book discusses as well the various methods used in the production of man-made gemstones and the commercial use in gem testing. The final chapter deals with the composition of synthetic gemstones. This book is a valuable resource for gemmologists and jewelers. Students who intend to become a qualified gemologist will also find this book extremely useful.
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The Journal of Gemmology

Author: N.A

Publisher: N.A

ISBN: N.A

Category: Precious stones

Page: N.A

View: 5077

Vols. for July 1964 include Proceedings of the Gemmological Association of Great Britain.
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Practical Gemmology

Author: DeeDee Cunningham

Publisher: N.A.G. Press

ISBN: 9780719804311

Category: Science

Page: 336

View: 4482

Robert Webster’s highly regarded work, Practical Gemmology, first published in 1943, has been through six editions and numerous reprints and was long considered the standard work for those learning the theory and science of gemmology. This classic, on which professional gemmology courses were founded, has been entirely revised by DeeDee Cunningham to return it to its esteemed place among current gemmological education books. Re-written and expanded, this completely updated book includes new material on high-tech treatments and synthetic diamonds as well as instrumentation, theory, testing and gemstone properties. Its nineteen lessons each serve as individual lectures and it pays considerable attention to covering all the background information and theory necessary for understanding every concept central to gemmological theory. Although suitable for readers of all levels of understanding, Practical Gemmology is specifically tailored to provide the information and diagrams necessary for the successful completion of diploma examinations and is an invaluable tool for gemmology students.
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The Spectroscope and Gemmology

Author: Basil Anderson,James Payne

Publisher: Robert Hale

ISBN: 9780719803215

Category: Science

Page: 269

View: 6749

Until 1933, the refractometer and the microscope were the two principal tools in gem testing. Then B.W. Anderson introduced the hand spectroscope which quickly became the third vital instrument for the UK gemmologist. Anderson and his lifelong colleague, Payne, both of the world's first full-time gemmological laboratory, were the pioneers in recognizing the vast potential of the spectroscope, and The Spectroscope and Gemmology is the extensively edited, updated, and enlarged version of Anderson's original papers. The distinguished gemmologist R. Keith Mitchell undertook the editing and added of chapters on the Pye spectrophotometer and on lasers. He also reproduced new line drawings of spectra in three aspects to accommodate the prism instrument in both the British version and in that favored by American gemmologists, and in another version as seen through the diffraction grating instrument.
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Gemstones of Pakistan

geology and gemmology

Author: Ali H. Kazmi,Michael O'Donoghue

Publisher: N.A

ISBN: N.A

Category: Nature

Page: 146

View: 865

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Gemmological Instruments

Their Use and Principles of Operation

Author: Peter G Read

Publisher: Elsevier

ISBN: 1483192261

Category: Science

Page: 340

View: 1906

Gemmological Instruments deals with the developments in diamond grading equipment and gem testing instruments since the publication of the first edition in 1978. These developments include improvements in the versatility and styling of existing instruments such as the reflectivity meter, the composite spectroscope, and the refractometer. It also addresses the criticisms in the first edition and provides a discussion of the advantages and disadvantages of different gem testing equipment. This book is organized into 16 chapters that describe groundbreaking instruments like the thermal conductivity diamond testers and home-constructed items that while innovative have not yet been commercialized. There are also chapters dealing with microphotography and identification of synthetics and stimulants. This book also provides a listing of gemstone constants and characteristic inclusions in natural and synthetic gemstones. This book will be of interest to people interested in equipment for gem testing and diamond grading.
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Beginner's Guide to Gemmology

Author: Peter G Read

Publisher: Elsevier

ISBN: 1483183122

Category: Nature

Page: 240

View: 8514

Beginner's Guide to Gemmology presents the profiles of the principal gem materials. This book discusses the interesting characteristics of gemstones as the growing consumer market jewelry resulted in increased sales of gem testing instruments. Organized into 12 chapters, this book begins with an overview of the development of the science of gemmology. This text then explains the fundamental qualities necessary in a gem, including color, hardness, specific gravity, crystallography, refractive index, pleochroism, critical angle, luminescence, and absorption spectra. Other chapters consider the organic gem materials, including amber, ivory, coral, tortoiseshell, jet, ebony, and pearl. This book discusses as well the various methods used in the production of man-made gemstones and the commercial use in gem testing. The final chapter deals with the composition of synthetic gemstones. This book is a valuable resource for gemmologists and jewelers. Students who intend to become a qualified gemologist will also find this book extremely useful.
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Practical Gemmology - A Study of the Identification of Gem-Stones, Pearls and Ornamental Minerals

Author: Robert Webster

Publisher: Read Books Ltd

ISBN: 1447498844

Category: History

Page: 194

View: 9933

Here will be found a shortened but complete course in gemmology, following the traditional lines adopted in teaching students at Chelsea Polytechnic in preparation for the Gemmological Association Examinations. This book contains classic material dating back to the 1900s and before. The content has been carefully selected for its interest and relevance to a modern audience.
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Gemology

Author: Cornelius S. Hurlbut,Robert C. Kammerling

Publisher: John Wiley & Sons

ISBN: 9780471526674

Category: Science

Page: 336

View: 9296

This edition has been revised and expanded to reflect recent and varied developments in the highly specialized field of gemology. Among these are: gemstone synthesis; imitation gems; the alteration of gems to improve, add, remove or otherwise change their color, phenomena or clarity; the importance and widespread uses of the microscope to reflect the aforementioned developments; and a number of new gem minerals or new forms of previously described minerals recently discovered or actively marketed for the first time. The chapter on Descriptive Gemology has been divided into two groups: important gemstones (those gem materials most widely used in jewelry and ornamental objects) and less important gemstones (those less commonly encountered).
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Gemmologists' Compendium

Author: Robert Webster,E. Alan Jobbins

Publisher: Antique Collectors Club Limited

ISBN: 9780719801013

Category: Antiques & Collectibles

Page: 240

View: 9488

The first part of the book is a comprehensive glossary of gemstones and the terms used in connection with them. The second part contains tables of essential information for gem identification. There are also sections on such useful topics as cuts for gemstones, synthetic and manufactured gems, test for precious metals and conversion formulae.
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Gem Testing

Author: B. Anderson

Publisher: Read Books Ltd

ISBN: 1447494652

Category: Science

Page: 254

View: 5328

This unusual work is a complete treatise on the identification of precious stones that is thoroughly recommended for inclusion on the jeweller or antiquarian's bookshelf. Contents Include: Preface; How to Use The Book; Refractive Index and its Measurement; Double Refraction and How to Detect it; Colour, Colour Filters and the Dichroscope; Specific Gravity and How to Measure It; Detection of Synthetic and Imitation Stones; The Use of the Microscope; The Identification of Diamond; The Identification of Ruby; The Identification of Sapphire; The Identification of Emerald; Aquamarine and Alexandrite; The Identification of Zircon; The Identification of Topaz; The Identification of Pink, Mauve, etc. Stones; The Identification of Brown and Orange Stones; Quartz, Opal, and Garnets; Tourmaline, Peridot, and Spinel; Identification of Translucent and Opaque Stones; Amber, Tortoiseshell, Coral, and Jet; Pearls: Real, Cultured, and Imitation; Appendix: Glossary, Alphabetical Summary of Gem Species, Crystal Systems, Bibliography, Specific Gravity and Refractive Index Tables; Names and Addresses of Recommended Suppliers; and an Index. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.
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Gemmological Studies in Sanskrit Texts

English Rendering with Notes on Gemmology in Five Sanskrit Texts

Author: S. R. N. Murthy

Publisher: N.A

ISBN: N.A

Category: Precious stones

Page: N.A

View: 2008

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The Sisk Gemology Reference

Volume #1: Prominent Gems

Author: Jerry Sisk,Jim Wells Productions

Publisher: N.A

ISBN: 9780692713181

Category:

Page: 446

View: 7016

A comprehensive and visual gemology resource featuring more than 100 prominent gemstones.
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Gem and Stone

Jewels of Earth, Sea, and Sky

Author: Jenifer Altman

Publisher: Chronicle Books

ISBN: 1452119090

Category: Photography

Page: 132

View: 3672

Gem and Stone celebrates 50 different gems ranging from timeless classics like diamond and emerald to exotic beauties such as lapis lazuli, peridot, and even petrified wood. Altman's photographs capture the splendor of each gem alongside brief text highlighting the stones' chemical makeups, metaphysical properties, and associated folklore throughout human history. Hand-drawn illustrations by Heather Smith Jones and an insightful foreword by mineralogist Thomas W. Overton round out this lustrous volume. Rock hounds, new age practitioners, and contemporary decorators and fashionistas will all delight in this treasure of a book.
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