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54 THE CURIOUS LORE OF PRECIOUS STONES
About the middle of the past century, the demand for agate amulets was so great in the Soudan that the extensive agate-cutting establishments at Idar and Oberstein in Germany were almost exclusively busied with filling orders for this trade. Brown or black agates having a white ring in the centre were chiefly used for the fabrication of these amulets, the white ring being regarded as a symbol of the eye. Hence the amulets were supposed to neutralize the power of the Evil Eye, or else to be emblematic of the watchfulness of a guardian spirit. The demand for these amulets has fallen off greatly, but when it was at its height single firms exported them to the value of 40,000 thalers ($30,-000) annually, the total export amounting to hundreds of thousands of thalers. Even at present a considerable trade in these objects is still carried on. That there is a fashion in amulets is shown by the fact that, while red, white, and green amulets are in demand on the west coast of Africa, only white stones are favored for this us,e in Northern Africa.

There are a few talismanic stones which have gained their repute in our time, notably the alexandrite, a variety of chrysoberyl found in Eussia, in the emerald mines on the Takowaya, in the Ural region. The discovery of this variety is stated to have been made in 1831 on the day Alexander II (then heir-apparent) reached his majority, and it was therefore named alexandrite, by Nordenskjöld, the mineralogist. The stone as found in gem form rarely weighs over from one to three carats, and is characterized by a marked pleochroism of a splendid green changing to a beautiful columbine red. But in Ceylon much larger gems are found, some few weighing
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