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Excerpt from Guide Collection of Gemstones: Museum of Practical Geology Various classifications of precious stones have been adopted from time to time, but all are more or less unsatisfactory. In Chapter IV. Of this guide-book the stones are considered, in the order in which they occur in the cases starting from Case A. Chapter I. Deals with the properties of precious stones with special reference to their discrimination; in Chapter II. The principal styles of cutting are touched upon; whilst Chapter III. Deals shortly with the imitation, artificial treatment and forma tion of precious stones. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.