Amethyst

Amethyst enhances creative thinking and calms the mind. Known as a stone of spiritual protection and purification, it cleanses one's mind of negativity and creates space for intuition, peace, and creativity. For this reason, Amethyst is especially useful during meditation or while problem solving at work. 

The name is derived from amethustos, an ancient Greek word meaning "sober." According to legend, Amethyst was a crystal stained purple by the tears of Dionysus, the god of wine. They believed drinking from a vessel made of Amethyst would ensure safe revelry.