This book is intended as a how-to-text. Many fine books are available which provide instruction in techniques. The intent of this text is to serve as a look-up book. My own library of jewelry texts is full of illustrations, examples and how-to's. I found that once I read a new book, it went on the shelf until I needed to find a formula, definition or mathematical data. The question was always, where was that bit of information in all those books? The time came to collect all the data my students and I required and compile a comprehensive reference. Years in the classroom, at the bench and speaking with colleagues led to the material contained in this reference. Some of it is easily found in any jewelry text. Much of the information is difficult to find, some nearly impossible without encyclopedic references. Most jewelry texts ignore gemology and legal information entirely. Material newly generated for this text (example, ring blank size strips) has been tested over the years in my own shop and classroom. The format, type size and structure of this work is intended to make it an easy reference tool. It can take its place on a desk or at the bench, where a tool belongs. Continue to build a library of how-to-books; use this book.