Tourmaline is known as the rainbow gemstone because it exists in various colors. It is also the largest group of boron silicate minerals and forms when mineral-rich hot waters seep into cavities and rock fractures. Bi-color tourmaline, known for its striking two-tone hues, is primarily found in several renowned regions worldwide. Some of the  famous countries known for producing bi-color tourmaline are Brazil, Madagascar, Mozambique and Afghanistan
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