Dumortierite is a stone of the mind and of confidence. It is a stone whose energies tap into and strengthen the bearer"?s mental acuity and memory - especially in those areas related to Math and Language. By sharpening focus and acuity this stone can help strip self-doubt and heighten the bearer"?s ability to stand up for themselves. It comes in a wide variety of colors from red/brown - violet/blue - dark blue with dark blue being the most common. From China.