Turquoise is positively the best gemstone in the world. High in iron and copper, turquoise balances yin and yang which is why it has been used by shamans and medicine men for centuries.. Associated with the Native Americans, turquoise was believed to bring good luck and ward off evil spirits, and is a stone of future evolution. It brings a calming energy and is a harmonizing influence in a sleepy or agitated state, addressing the needs of the spirit and providing for inner-peace.