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" Emeralds are cut on a copper wheel with emery, and polished on ' a tin wheel with rotten-stone. " In a good gem," says Mr Emanuel, " the surface must be perfectly straight and smooth, so as to cast no darkening shadow on any of its particles. "
A Treatise on Gems: In Reference to Their Practical and Scientific Value : a ... - Page 95
by Lewis Feuchtwanger - 1838 - 162 pages
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A Treatise on Gems: In Reference to Their Practical and Scientific Value : a ...

Lewis Feuchtwanger - Beads - 1838 - 192 pages
...found, sends them abroad already cut and polished en cabochon ; but very often they are cut over again on a copper wheel, with emery, and polished on a tin plate ; it receives in setting a gold foil. The value depends principally upon its intrinsic properties,...
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A Popular Treatise on Gems: In Reference to Their Scientific Value

Lewis Feuchtwanger - Building stones - 1859 - 512 pages
...found, sends them abroad already cut and polished in cabochon ; but very often they arc cut over again on a copper wheel, with emery, and polished on a tin plate : they receive in setting a gold foil. The value depends principally upon its intrinsic properties,...
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Mani-málá, or a treatise on gems, Part 1

Sourindro Mohun Tagore - Gems - 1879 - 558 pages
...assured me it was an Emerald, and not a Beryl as I suggested." The Cutting of Emerald. THE Emerald is cut on a copper wheel with emery and polished on a tin one with rotten stone. It is generally trap-cut. The object of cutting it as a brilliant, with rounded...
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Mani-málá: Or, A Treatise on Gems, Volume 1

Sourindro Mohun Tagore - Gems - 1879 - 552 pages
...assured me it was an Emerald, and not a Beryl as I suggested." The Cutting of Emerald. THE Emerald is cut on a copper wheel with emery and polished on a tin one with rotten stone. It is generally trap-cut. The object of cutting it as a brilliant, with rounded...
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The School of Mines Quarterly, Volumes 1-2

Chemistry - 1880 - 532 pages
...worth from $100 to $200 per carat. The light shades are much less valuable than the dark. The stone is cut on a copper wheel with emery, and polished on a tin wheel with rotten stone. It is most often cut in trap shape, but if flawed, as a brilliant with rounded...
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The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and ..., Volume 8

Encyclopedias and dictionaries - 1888 - 966 pages
...are the Hope emerald, weighing 6 oz, and those of the Russian, Saxon, and I'apal crowns. Emeralds are cut on a copper wheel with emery, and polished on a tin wheel with rotten-stone. " In a good gem," says Mr Emanuel, " tho surface must be perfectly straight...
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The Encyclopaedia Britannica: A Dictionary of Arts, Sciences and ..., Volume 8

Thomas Spencer Baynes, William Robertson Smith - Encyclopedias and dictionaries - 1890 - 938 pages
...the Hope emerald, weighing 6 oz, and those of the Russian, Saxon, and I'.inril crnwna. Emeralds are cut on a copper wheel with emery, and polished on ' a tin wheel with rotten-stone. " In a good gem," says Mr Emanuel, " the surface must be perfectly straight...
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The New Werner Twentieth Century Edition of the Encyclopaedia ..., Volume 8

Encyclopedias and dictionaries - 1907 - 798 pages
...are the Hope emerald, weighing 6 oz, end those of the Russian, Saxon, and Papal crowns. Emeralds are cut on a copper wheel with emery, and polished on a tin wheel with rotten-stone. " In a good gem," says Mr. Emanuel, "the surface must be perfectly straight...
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Bulletin of the Pan American Union

Pan American Union - America - 1909 - 722 pages
...brittle and comparatively soft when freshly mined, but bocomes much harder on exposure to air. The gem is cut on a copper wheel with emery and polished on a tin wheel with rotten stone. In a good stone the surface must be perfectly straight and smooth, the form...
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