Dumortierite is a stone of the mind and of confidence. It is a stone whose energies tap into and strengthen the beareråÕåÔ___åÕÌàåÕ_åÕåÔåÕÌ¦åÕåÔ_åÕÌàåÕ_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 beareråÕåÔ___åÕÌàåÕ_åÕåÔåÕÌ¦åÕåÔ_åÕÌàåÕ_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. 25 - 35 stones, 1/2" to 1" per stone.