Tag Archive for tourmaline jewelry

October Birthstone – Tourmaline

tourmaline-birthstone

previous month zodiac signs next month > Tourmaline fact fileCrystal Structure: long and sub-triangular Chemical Composition: silicate of Boron and Aluminum Hardness: 7-7.5 MOHS Refractive Index: 1.620 and 1.640 Colors: black, red, pink, green, and blue “Watermelon” colors – red…