Make a contemporary statement with the dumortierite 10x20mm double drilled beads from Dakota Stones. These rectangular beads feature two stringing holes drilled through their middles, making them excellent for use in watch bands. Each bead displays a dark blue color streaked with stripes of black. Dumortierite is vitreous and varies in color from blue, green and brown to the more rare violet and pink. It is said that this gemstone can enhance organizational abilities and orderliness. This gemstone is mined in North and South America, as well as Europe and Mozambique. These beads are available in 8-inch strands.