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.