This rare book contains a detailed treatise on the different methods used for machining diamonds and gem stones in an industrial production. Written as a more scientific treatment of the art of cutting and polishing hard metals, the authors aim in collating the information contained herein was to bring before the public a general survey of modern methods of machinery, i.e. splitting, cleaving, bruting, grinding, and polishing, of flat and curved surfaces. Chapters contained within this book include: Technology of Matching Methods, Dividing of Diamonds and Gem Stones, Bruting, Cutting and Polishing, Drilling and Boring of Holes, Carving and Engraving, Diamond Dust, Diamond Dust Impregnated Tools, The Manufacture of Diamonds and Gems, Manufacture of Watch and Pivot Bearings, and many more. This book has been elected for modern republication due to its immense educational value, and is proudly republished here complete with a new introduction to the subject.