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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.
This 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.
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.
A comprehensive and visual gemology resource featuring more than 100 prominent gemstones.
This guide helps buyers to evaluate these spectacular gems and it updates professionals on new treatments and sources of corundum and emerald. Using close-up photographs, the book shows how to make visual judgements about clarity. transparency, cut quality and brilliance. In addition, it helps you to understand lab reports and find appraisers and labs. You will also get tips on detecting imitations and synthetic stones. Let this guide provide the in-depth information you will need to be a smart buyer. Topics in this guide include: Quality evaluation; Gem treatments; Fakes and synthetics; Lab reports; Geographic sources; Appraisals; Gem cleaning & care; Savvy buying.
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.
Popular Gemmology constitutes a definitive guide on many aspects of gemmology, covering a wide range of natural and manufactured gems, their taxonomy, and the methods in which they are machined. The perfect book for both the amateur and professional, this text presents in an accessible manner for the general reader accurate knowledge of the world of gems, designed for the gem-lover, mineral collector, jeweller, and the lapidary. The sections of this book are divided according to the major style of cutting most appropriate for each gem, with chapters including: The Lure of Gems, Recognising Gems, Faceted Gems, Cabochen and Carved Gems, Gems of the Silica Group, Gems and Genealogy, Man-made Gems, and Luminescent Gems. This scarce book has been elected for modern republication because of its educational value, and is proudly republished here complete with its original illustrations and a new introduction to the subject.
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.
Describes the appearance, formation, physical properties and characteristics, mining, and cutting of precious, semiprecious, and synthetic gemstones.