Gemmology

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Author: Peter G. Read

Publisher: Butterworth-Heinemann

ISBN: 0750664495

Category: Science

Page: 324

View: 7754

Since Gemmology was first published, thousands of readers have used it to gain an in-depth appreciation of the science of gemmology, its history and practice. This third edition has been completely revised to cover the latest methods of gem enhancement and identification, as well as the most up to date test instruments and laboratory techniques. It includes details of the Gemmological Associations recently introduced Foundation course, and even provides sample examination questions. * Contains essential information for the Gem-A exams * Fully updated to cover recent advances and instruments * An invaluable resource for gemmologists worldwide

Gemmology

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Author: P. G. Read

Publisher: Elsevier

ISBN: 1483144674

Category: Nature

Page: 370

View: 1678

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.

Beginner's Guide to Gemmology

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Author: Peter G Read

Publisher: Elsevier

ISBN: 1483183122

Category: Nature

Page: 240

View: 620

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.

Gemstones of Pakistan

geology and gemmology

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Author: Ali H. Kazmi,Michael O'Donoghue

Publisher: N.A

ISBN: N.A

Category: Nature

Page: 146

View: 4481

The Journal of Gemmology

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Author: N.A

Publisher: N.A

ISBN: N.A

Category: Precious stones

Page: N.A

View: 746

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

Practical Gemmology

A Study of the Identification of Gem-stones, Pearls, and Ornamental Minerals

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Author: Robert Webster

Publisher: N.A

ISBN: N.A

Category: Gems

Page: 209

View: 9421

The Spectroscope and Gemmology

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Author: Basil Anderson,James Payne

Publisher: Robert Hale

ISBN: 9780719803215

Category: Science

Page: 269

View: 9134

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.

Gemstones

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Author: Michael O'Donoghue

Publisher: Springer Science & Business Media

ISBN: 9400911912

Category: Juvenile Nonfiction

Page: 372

View: 9834

Gemstones is the first attempt in English to bring together the geological, mineralogical and gemmological developments that have taken place during the last thirty years. Though there have been many gemstone books published in that time, most have been concerned, understandably and rightly, with the science of gem testing and have covered that area very well. Details of the geological occurrence of many of the classic gemstones, and of nearly all those which have only recently been discovered, have been less adequately dealt with. Coverage has been restricted to a number of papers in a wide variety of geological and mineralogical journals. Gemstones hopes to get the balance right. In the preparation of the book all the journals and monographs in the field have been consulted so that the book should stand for some years as the authority to which gemmologists and others turn in the first instance. Ease of reference and depth of coverage make Gemstones both a reference book and a bench book. Acknow ledgements I am grateful to Brian Jackson of the Department of Geology, Royal Museums of Scotland who read the manuscript and painstakingly indicated places where amendment or alteration was needed. I am also grateful to the publishers of the books on which the line illustrations are based. The colour plates present in the book derive from a number of sources, which I would like to acknowledge as follows. Plates 1, 4-15 and 17 Crown copyright reserved.

Practical Gemmology - A Study of the Identification of Gem-Stones, Pearls and Ornamental Minerals

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Author: Robert Webster

Publisher: Read Books Ltd

ISBN: 1447498844

Category: History

Page: 194

View: 1957

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.

The Diamond Formula

Diamond Synthesis--a Gemmological Perspective

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Author: Amanda S. Barnard

Publisher: Butterworth-Heinemann

ISBN: 9780750642446

Category: Reference

Page: 166

View: 2010

'The Diamond Formula' offers the diamond industry and all interested parties a comprehensive text on synthetic diamonds, joining together the research, achievements, theories, experimental and analytical data by recognized experts in the field, while encompassing a gemmological interpretation. The book offers the average gemmologist, gemmological (or mineralogical) student, or interested party, a concise and easy to decipher overview of the synthesis of diamonds to date. Each of the elements and various topics have at some time been the subject of a lengthy and detailed text in their own right and references are used to ensure that the reader can follow up these leads. The text begins with the history of diamond synthesis, and the theories on which much of the early work was based, before discussing the principles on which the modern processes rely. The following chapters cover the advent of success, commercial applications, synthetic diamond products, producers, gemmological properties and identification of synthetic diamonds. The final section discusses briefly diamond synthesis by CVD and application for this technology. Comprehensive text for a wide market Easy to decipher overview of the synthesis of diamonds Detailed reference section for follow up work

Gemmological Instruments

Their Use and Principles of Operation

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Author: Peter G Read

Publisher: Elsevier

ISBN: 1483192261

Category: Science

Page: 340

View: 7515

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.