Minas Gerais and Paraíba
Tourmaline
Brazil gives tourmaline in almost every colour, from rose to deep green. The most famous is Paraíba tourmaline, a vivid copper-bearing blue-green first found in the late 1980s in the state that gave it its name.
Hardness 7 to 7.5. Suits rings worn with a little care, in a protective setting.