The best green Tourmaline ever found comes from Tanzania, Africa. It naturally contains Chromium (or Vanadium), which makes this gem exhibit the same beautiful green color observed in top quality Tsavorite or Emerald. Because of its Chromium (or Vanadium) content, the trade named it 'Chrome Tourmaline'. Chrome tourmaline is the most valuable of all green tourmalines with a price several times higher than the price of regular Green Tourmaline. That's why it is very important to make sure that what you are buying is a Chrome Tourmaline not just a "Green" Tourmaline.
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