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Introductory text for beginning faceters. Learn the history, the terminology, the machines available, the parts of the machines and how to use them and learn to facet your first stone.
This book contains a collection of the author's finest faceting designs, taking severalyears to complete. It provides more than 50 optimized patterns in a range of shapesand introduces a new solid design concept known as 'fusion'. The 'fusion' concept is anadaptable, high performing design principle that empowers the faceter to achieve wellbalanced, strong performing cuts. It is termed 'fusion' as it balances odd symmetrywith even symmetry, to create a true 'fusion' between performance and design.The author believes that by considering gem faceting designing an art form, newground can be explored, and accounts for some of the more bespoke designs containedwithin the publication.Overall, the author has been mindful to include designs that will appeal to and benefitmost faceters, including: * 50 designs for the commonly used 96 index* A selection of designs for the 72, 84, and 120 indexes* Optimized angles to work in materials with refractive indices over a wide range* Frosted designs like the butterfly on the cover and 7 pointed stars* 16 Round designs not including frosted designs* 7 Square designs including square cushions* 4 Trillion and 2 heart designs* 10 Oval and 3 pear designs* 6 Rectangular designs including rectangular cushions * 3 Hexagons and other designs with assorted shapes
The author of, "Faceting History: Cutting Diamonds and Colored Stones" has for a long time had a deep interest in learning how the early faceters (cutters) of diamonds and colored gemstones were able to complete their work. What methods did they use? What equipment did they have to make success possible? How soon did they discover how to complete the many phases necessary to accomplish their work? How did the equipment and methods differ between fashioning diamonds and faceting colored stones? These are just a few of the questions that the author wanted to find the answers for. In looking for answers to these and other questions, the author found that there were bits and pieces of information available in many previous books, but there was not a good book available that would answer most of his questions. Upon hearing the author's remarks about this fact, one of the librarians at the wonderful library located at the Gemological Institute of America's Carlsbad campus said that if such a book was not available, "maybe you should write the book!" Well, the author had been thinking of doing just that, but the remark caused the author to see the light and agree to get started on the project. Little did he know then that the project would require many months of eight hour days over seven day weeks to get the book completed. He decided to write a book that would answer these and other related questions that he had. The thought also occurred to him that such a book would be a valuable volume to be placed in libraries of individual faceters around the world. He realized that such a book would also be of great value to anyone who works behind a Jewelry store counter. A successful sales person isone who is knowledgeable about the products that they are selling. A book of faceting information would be extremely valuable if read and re-read from time to time. A customer in the Jewelry store will no doubt be favorably impressed by a sales presentation that is made with the use of interesting and informative information about diamonds and the various colored gemstones. The customer will be convinced that the sales person knows about what they are talking. The author has spent nearly three years on the project of researching the GIA library and other libraries, along with the extensive personal library of gemstone related books that he personally possesses. Many conflicting reports were noted in his study. He has made the statements in his book reflect the most commonly accepted opinions, of the most respected authors' works that he has found in his research. History is only obtainable from the earlier works of other authors. We cannot go back to the long past centuries ourselves, to see first hand what really happened and when it happened. A study of faceting history requires making the best choices of the information that is available. This completed book answers questions as to why the fashioning of diamonds was/is so different from the faceting of colored gemstones. The book compares the needed equipment and the methods that have brought the greatest successes. In addition, a great deal of other information connected to faceting is included. There are seven chapters in the book and there are over 125 photographs of the early equipment and methods that were used. The photographs show the faceters, the workroom conditions, and the tools and equipment that they used to completebeautiful and lasting gemstones. The book chapters are titled: An Introduction to Faceting, Early Man's Stone Appreciation, Diamond Fashioning Procedure and Equipment, Colored Stone Faceting Procedure and Equipment, The Evolution of Cut Designs, Famous and Historic Gemstones, Sources of Diamond and Colored Stone Rough, and lastly, Advances in Faceting Over the Past One Hundred Years. Within each of these chapters the reader will find a multitude of additional and interesting information. Chapter One: Early Faceting Inform
Amateur faceter Tom Herbst helps you expand your faceting horizons. You will learn about the optics and mathematics behind the magic of gemstones. Subsequent chapters on the properties and treatment of common gem materials will help you identify and make the most of your valuable rough.
The Secret Teachings of Gemcutting is a collection of classic gemstone designs spanning 500 years. The designs are presented with full color photos, historical information, cutting advice, and design information. These are industry standard designs for the gem and jewelry trade for all the major gemstone cutting centers around the world. This collection marks the first time the designs have been compiled for public consumption. This volume will prove useful to both gemcutters who want to cut these essential designs and to jewelers who would like a visual aid to present different gemstone styles to their customers. Aside from the designs, the introductory chapters of the book contain invaluable information about gemstone design, optics, gem physics, modifying designs, pairing rough gems with an appropriate design, and more.
Human ratings are subject to various forms of error and bias. Since the early days of performance assessment, this problem has been sizeable and persistent. For example, expert raters evaluating the quality of an essay, an oral communication, or a work sample, often come up with different ratings for the very same performance. In cases like this, assessment outcomes largely depend upon which raters happen to provide the rating, posing a threat to the validity and fairness of the assessment. This book provides an introduction to a psychometric approach that establishes a coherent framework for drawing reliable, valid, and fair inferences from rater-mediated assessments, thus answering the problem of inevitably fallible human ratings: many-facet Rasch measurement (MFRM). Throughout the book, sample data taken from a writing performance assessment are used to illustrate key concepts, theoretical foundations, and analytic procedures, stimulating the readers to adopt the MFRM approach in their current or future professional context.
"Practical recipes for visualizing data"--Cover.