Chrome 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 Colored by Chromium, these are the more valuable green tourmaline s. Can be confused with emerald and tsavorite garnet . Enhancements Chrome tourmaline is not enhanced. More information on gemstone enhancements. All rights reserved.