![]() The quartz is typically synthesized in devices called "autoclaves" kinds of pressure cookers that make up pressure and temperature of chemical solutions. More subtle and rare on the market, synthetic amethysts. ![]() These objects are usually sold at low prices in Moroccan souks. Violet inks generally do not support a shift in water or in acetone and this is enough to reveal the deception. It is certainly one of the most publicly known stones.Īmong the classic scams there natural quartz geodes painted in purple. This heat treatment can leave characteristic inclusions easily identifiable using magnification. It was and still is heavily harvested throughout the world today for jewelery and decoration. Also, amethysts are heat treated extensively to get citrines. ![]() Around 500☌, amethyst turns yellow-orange, but fades again if the temperature is raised to 600☌, before becoming milky quartz. The crystals of some deposits may fade to light, but the color of amethyst is generally stable to 250☌, beyond, most amethyst fade. Its color is related to the presence of Fe 4+ ions impurity whose content varies in the range of tens to hundreds of ppm (100 ppm = 0.01%), but also sometimes in a surrounding natural radioactivity. ![]() Its name comes from the ancient Greek "amethustos" (which preserves drunkenness) probably because it is the color of watered wine. ![]()
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