Diamonds and precious stones, a popular account of gems .. . Fig. 50.—The Blue Diamond of Mr. Hope. A precious stone without a rival is the blue dia-mond of Mr. Hope. Its weight is 44^ carats, andits colour is the blue of the most beautiful sapphire,added to an adamantine lustre of the utmost bril-liancy. It was purchased for $83,700, but com-petent judges declare that it is worth more. ENGRAVING UPON THE DIAMOND. Notwithstanding its wonderful hardness, the dia-mond has been engraved. In the Paris Exhibition of 1867, in the Italiansection, an engraved diamond was exhibited. It. -Surfaces of Br
Diamonds and precious stones, a popular account of gems .. . Fig. 50.—The Blue Diamond of Mr. Hope. A precious stone without a rival is the blue dia-mond of Mr. Hope. Its weight is 44^ carats, andits colour is the blue of the most beautiful sapphire,added to an adamantine lustre of the utmost bril-liancy. It was purchased for $83,700, but com-petent judges declare that it is worth more. ENGRAVING UPON THE DIAMOND. Notwithstanding its wonderful hardness, the dia-mond has been engraved. In the Paris Exhibition of 1867, in the Italiansection, an engraved diamond was exhibited. It. -Surfaces of Brilliants compared to their weight,indicate the thickness of the stone. ertical lines CELEBRATED DIAMONDS. IO9 was engraved in the sixteenth century by Jacopo orComo da Trezzo; and it was set in a unique cylin-drical ring of gold, by aid of a movable colletupon pivots. PART IV. Sapphire. Ruby. Balas Ruby. Spinel Ruby. Topaz. Emerald,Beryl. Aquamarine. Cymophane, Turquoise. What wonder then, if fields and regions hereBreathe forth elixir pure, and rivers mnPotable gold, when with one virtuous touchTh arch-chemic Sun, so far from us remote,Produces, -with terrestrial humour mixdHere in the dark, so many precious )Of colour glorious, and effects so rare ? Every one knows that common substance calledc/qy, which is so easily mixed into a paste withwater. But every one does not consider perhapswhat an important part in agriculture and industrythis familiar substance performs. All soils that are of value for the production ofvegetables contain clay. The principal element ofthis
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgems, booksubjectprec
