A Treatise on Diamonds, and Precious Stones: Including Their History--natural and Commercial. To which is Added, Some Account of the Best Methods of Cutting and Polishing ThemLongman, Hurst, Rees, Orme, and Brown, 1813 - 168 Seiten |
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Agates Alumine Amethyst appears Aquamarine beautiful bizel blowpipe blue Brazil Brazilian brilliant broaches brown cabochon called carats Carnelian Ceylon Chalcedony chatoyant Chrysoberyl Chrysolite collet colour colourless conchoidal considerable cut and polished degree Diamond ear-drops Emerald Engravings esteemed estimation Europe exhibit facets Felspar finest flaws foliated fracture Garnet girdle Glucine gravity varies green greenish hardness hence hexahedral hyacinth imbedded India inferior JARGOON Jasper jeweller jewellery Klaproth lamellar lamellar structure laminæ lapidaries latter less lour lustre Minas Novas mineral mineralogists mond necklaces occurs opake Opal Oriental ornaments Oxide of Iron pale perfect perfectly pincers plate possession precious stones present primitive prism pyramids quartz rare refractive Regent Regent Diamond rhomboid ring stone rock crystal rolled pieces Ruby Sapphire semi-transparent Silex sometimes specific gravity specimens Spinelle substance surface tinge tint tion Topaz Tourmaline transparent Turquois unfrequently varieties Vauquelin violet vitreous yellow
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Seite 77 - ... with an almost imperceptible tendency to one or other direction in different stages of the work, examining each facet at very short intervals, in order to giving as great precision as possible to its size and form. The cutting being completed, the polishing is effected by changing the mill-wheel for another usually made of brass, the surface of which is charged with fine emery, tripoli or rotten-stone, by the successive use of which the facets...
Seite 5 - Diamond, on the contrary, whether blazing on the crown of state, or diffusing its starry radiance from the breast of titled merit, or "in courts and feasts and high solemnities...
Seite 46 - ... materially detract from its beauty, and consequently from its value. " The removal of flaws is a matter of great importance : for, owing to the form in which the diamond is cut, and its high degree of refrangibility, the smallest fault is magnified, and becomes obtrusively visible in every facet.
Seite i - Diantonde and Precious Stones, including their History, Natural and Commercial. To which is added, some Account of the best Methods of cutting and polishing them.
Seite 29 - the only place where diamonds have certainly been found in modern times, are the central and southern parts of India Proper, the peninsula of Malacca, the island of Borneo, and the mountainous district called Serro Do Frio, and other places in Brazil. Neither the rock in which it occurs, nor the other minerals with which it is accompanied in Malacca and in Borneo, are at all known. In India it is found in detached crystals, in a kind of indurated ochery gravel, but whether or not this is its native...
Seite 69 - The king of Pegu and the monarchs of Siam monopolize the fine Rubies, as the sovereigns of the peninsula of India have done the Diamonds. The finest Ruby in the world, is in the possession of the first; its purity has passed into a proverb, and its worth, when compared with gold, is inestimable. The Subah of the Divan is also in the possession of a prodigiously fine one, a full inch in diameter. The Empress Catharine, of Russia, possessed one Ruby of the size of a pigeon's egg.
Seite 29 - Brasil, like those of India, are found in a loose gravel-like substance immediately incumbent on the solid rock and covered by vegetable mould and recent alluvial matter; this gravel consists principally of rounded quartz pebbles of various sizes mixed with sand and oxide of iron, and enclosing rounded topazes, blue, yellow, and white, and grains of gold. In some parts of the Diamond territory of Serro do Frio, which I visited, the gravel is cemented by means of the oxide of iron into a considerably...
Seite v - ... show how easily the masses have been led astray, and how imitative and gregarious men are, even in their infatuations and crimes.
Seite 5 - ... star of the girasol, the various colours, combined with high lustre, which distinguish the ruby, the sapphire, and the topaz, beautiful as they are on a near inspection, are almost entirely lost to a distant beholder ; whereas the diamond, without any essential colour of its own, imbibes the pure solar ray, and then reflects it, either with undiminished intensity, too white and too vivid to be sustained for more...