A Treatise on Gems, in Reference to Their Practical and Scientific Value: An Useful Guide for the Jeweller, Amateur, Artist, Lapidary, Mineralogist, ... American Gems, and Ornamental and Archit - Softcover

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Excerpt from A Treatise on Gems, in Reference to Their Practical and Scientific Value: An Useful Guide for the Jeweller, Amateur, Artist, Lapidary, Mineralogist, and Chemist; Accompanied by a Description of the Most Interesting American Gems, and Ornamental and Architectural Materials

In order to distinguish the crude and polished precious stones, it is necessary to describe more particularly the properties and other peculiarities Of the minerals, which we shall now proceed to do.

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