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Precious Stones and Gems

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XV
induced to send my two sons on a visit to the various Pearl fisheries of the world. The information which I received from them was of so interesting a character, that my atten­tion was forcibly directed to the entire subject of Pearls, and I soon accumulated far too much matter for introduc­tion into a general volume on Precious Stones. Under these circumstances I set myself the task of writing a separate work, devoted entirely to Pearls. This appeared in 1886, under the title of "Pearls and Pearling Life;" and was so well received as to be at present out of print.
It may be noted that the present work refers only to Nature's Gems, and does not therefore deal with artificial gems, except in so far as they may throw light on the probable operations of Nature.
Stimulated by the marked encouragement which my labours on the subject of Precious Stones, Gems, and Pearls have received, I have endeavoured to make the volume in its present form still more worthy of its popularity; and with this view, have subjected the work to a searching revision.
Thus improved, the present (the sixth) edition is sent forth in the conscientious belief that it contains an amount of information on Precious Stones and Gems— partly scientific and partly practical—not to be found in any other work.
I am pleased to acknowledge the valuable aid which I have received from Mr. F. W. Rudler, Curator of the Museum of Practical Geology, in Jermyn Street, whose mineralogical knowledge has always been cheerfully placed at my service when difficulties of a scientific character have arisen. I am also under obligation to Sir William Crookes, F.R.S., for scientific advice, and to Mr. North for his chapter on the modern system of round diamond-cutting ;
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