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The majority of the topaz on the world market comes from the Capao mine in Brazil. Because the natural colors of topaz tend to be quite pale, the stone is routinely treated to make its colors more vibrant. For example, yellow stones turn pink...
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The majority of the topaz on the world market comes from the Capao mine in Brazil. Because the natural colors of topaz tend to be quite pale, the stone is routinely treated to make its colors more vibrant. For example, yellow stones turn pink when subjected to heat—the process is so common for topaz that it’s called “pinking.” Untreated, so-called “precious” or "imperial" pink topaz is actually very rare. Other topaz crystals, particularly those mined in Sri Lanka, are irradiated to make them blue. Radiation leaves the stones “hot” for several months, but the gems lose their radioactivity and are safe to wear after just a few months. Still, because of health concerns, topaz is often labeled to help consumers better understand what they are about to buy and how the gem’s hue was achieved.

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