Pink Tourmaline Gemstones Hardness 7.0. Tourmaline and opal are the birthstones of the month of October.
Tourmaline is the national gemstone of the United States.
Appearance Pink to reddish in color. Enhancements Pink, red and purple tourmaline is occasionally heat treated to improve color. More information on gemstone enhancements. Heated to improve color. New 2.15 ct.