Evening Republican, Volume 59, Number 76, Rensselaer, Jasper County, 31 March 1917 — Absolute Test for Diamond. [ARTICLE]

Absolute Test for Diamond.

One of the oldest tests for a diamond is, of course, the practice of drawing it over a sheet of glass. The popular idea that a paste article will not make any mark is said to be incorrect. Well-made imitation diamonds' commonly scratch glass, but do not cut it A real diamond drawn quite lightly over the surface cuts the glass so completely that the slightest blow will cause a separation. Another old test is that in which a file is employed. \ln the case of a real stone dealers say that it Is impossible to make any impression with the Implement, while an imitation article is easily marked.