TESTING FAKE GEMS.
CLEVER FORGERIES. Jewel forgers have become so clever that a special gem-testing institute has been established in Vienna (says Popular Mechanics), and similar studies are being carried out in Great Britain to detect imitations. Imitation diamonds are numerous, and it is possible to make real ones in the laboratory; tut the cost of the process is about 200,000 dollars a carat. Rubles can be made. by laboratory methods in Efoogt six,.JiflJßr.Si and,, some of them are so nearly like the real stones that other tests than with the eyes are necessary to distinguish then. While the synthetic emerald has brilliance and realistic colour, it usually can be told from a genuine one with little difficulty. They are often built up in three parts, which are fastened by visible cement. The top and the bottom part may be glass crystals cut in many facets with a thin shaving of a real emerald between them to give the colour. Others may have a slight cavity between the two crystals which is filled with a green liquid. Both imitations are easily detected by submerging the stone in a certain kind of oil and holding it up to the light.
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Putaruru Press, Volume IV, Issue 137, 17 June 1926, Page 5
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199TESTING FAKE GEMS. Putaruru Press, Volume IV, Issue 137, 17 June 1926, Page 5
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