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Author: Peter G Read Publisher: Elsevier ISBN: 1483183122 Category : Nature Languages : en Pages : 241
Book Description
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.
Author: Peter G Read Publisher: Elsevier ISBN: 1483183122 Category : Nature Languages : en Pages : 241
Book Description
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.
Author: P. G. Read Publisher: Elsevier ISBN: 1483144674 Category : Nature Languages : en Pages : 370
Book Description
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.
Author: Antoinette Matlins Publisher: ISBN: 9780997014556 Category : Precious stones Languages : en Pages : 0
Book Description
Gem Identification Made Easy is the first and only book that explains in non-technical terms how to identify diamonds and colored gems, and how to separate natural gems from imitations, treated stones, synthetics, and look-alikes. The book's approach is direct and practical, and its style easy to understand. In fact, with this highly accessible guide, anyone can begin to master gem identification. Includes over 150 photographs and illustrationsover 80 in full color! Using a simple, step-by-step system, the authors explain how to properly use essential but uncomplicated instruments to identify stones, what to look for gemstone by gemstone, and how to set up a basic lab at modest cost. Three of the instruments are inexpensive, portable, pocket instruments that, when used together, can identify almost 85% of all precious and popular stones. The key to avoiding costly mistakes and recognizing profitable opportunities is knowing both what to look for and what to look out for. Gem Identification Made Easy will help you: Open your eyes to the types of treatments, imitations, synthetics, look-alikes, and fakes in the gem market today. Learn how to tell the difference between them. Quickly spot: Synthetics, including synthetic emeralds and diamonds Filled diamonds Diffused "blue" sapphires and "red" rubies HPHT-treated diamonds ... and much more! Determine how to spot the newest "composite" imitations. Learn how to identify recently discovered gems such as "Mandarin" garnet, red "emerald," and North Carolina's chromium-rich emeralds. Discover new treatments such as surface coatings to create "fancy color" diamonds and improve or change the color of many gemstones. Know when to seek help from a professional gemologist or lab. Become more professional in your business or hobby.
Author: Antoinette Matlins Publisher: Turner Publishing Company ISBN: 0943763932 Category : Antiques & Collectibles Languages : en Pages : 467
Book Description
This colorful book offers you a window into the world of Mahatma Gandhi, one of the most amazing people of the twentieth century. You will learn about Gandhi’s life—from his time as a student in London to his work for equality in South Africa and India—and his methods of peaceful, but not passive, resistance to injustice.
Author: Raymond Walters Publisher: Welbeck Publishing ISBN: 9781787393509 Category : Nature Languages : en Pages : 0
Book Description
Introducing the inherent properties of dazzling selection of gems, gemologist Raymond Walters describes how each stone is formed and its key properties, what beliefs have been associated with them through history and around the world, and both their scientific and occult uses.
Author: Ken M. Harrison Publisher: Springer Science & Business Media ISBN: 1461413974 Category : Science Languages : en Pages : 183
Book Description
Grating Spectroscopes and How to Use Them is written for amateur astronomers who are just getting into this field of astronomy. Transmission grating spectroscopes look like simple filters and are designed to screw into place on the eyepiece of a telescope for visual use, or into the camera adapter for digicam or CCD imaging. Using the most popular commercially made filter gratings – Rainbow Optics (US) and Star Analyzer (UK) – as examples, this book provides the reader with information on how to set up and use the grating one needs to obtain stellar spectrograms. It also discusses several methods on analyzing the results. This book is written in an easy to read style, perfect for getting started on the first night using the spectroscope, and specifically showing how the simple transmission filter is used on the camera or telescope. No heavy mathematics or formulas are involved, and there are many practical hints and tips – something that is almost essential to success when starting out. This book helps readers to achieve quick results, and by following the worked examples, they can successfully carry out basic analysis of the spectra.
Author: Renée Newman Publisher: ISBN: 9780929975368 Category : Diamonds Languages : en Pages : 0
Book Description
Packed with close-up photographs, this reference shows you how to judge diamonds on the basis of how they look, rather than just on how they are graded. This handbook expands on the information provided in Newman's companion book, The Diamond Ring Buying Guide and covers additional topics requested by the readers.
Author: Peter G Read
Author: Peter G Read
Author: W. William Hanneman
Author: P. G. Read
Author: Antoinette Matlins
Author: Antoinette Matlins
Author: Raymond Walters
Author: 
Author: Julius Wodiska
Author: Ken M. Harrison
Author: Renée Newman