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. Comes in a wide variety of colors from red/brown - violet/blue - dark blue with the dark blue the most common. From China.