Cat's Eye 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 Tourmaline is often found with a cat's eye effect. Enhancements Cat's eye tourmaline is not enhanced. More information on gemstone enhancements. With a small blemish on top. 1995-2000 Gem Hut.