Publisher's Synopsis
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.
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