Dumortierite is a stone of the mind and of confidence. It is a stone whose energies tap into and strengthen the bearerÂ’s mental acuity and memory - esspecially in those areas related to Math and Language. By sharpening focus and acuity this stone can help strip self doubt and heighten the bearerÂ’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.