Tourmaline is a semi-precious mineral similar to granite. The name Tourmaline comes from the Sinhalese words “Tura Mali”, which means a stone of mixed colors. Tourmaline gemstone ranges in colors from magenta to teal-blue, meadow-green to vibrant yellow and even black. In 1554, Francisco Spinoza’s expedition discovered the first recorded green tourmaline crystal. Tourmaline is the birthstone for October, along with opal and the gemstone for 8th wedding anniversary. Tourmaline rates at a hardness of 7-7.5 on Mohs scale.