Tourmaline comes in a variety of unique colors from the most common colors, pink and green, to the extremely rare and valuable Paraiba seafoam color. Tourmaline can also occur in a bicolor and tricolor assortment. This includes watermelon tourmaline and can occur in either a tricolor transitioning from green to white to pink tourmaline, or a bicolor transitioning from green to pink. Tourmaline is one of the birthstones for October and is a common anniversary present for the 8th year.