Add shining colors of the sea to your designs with the blue and green quartz 12mm coin beads from Dakota Stones. Available by the strand, these beads display oceanic colors that vary from ocean blue and sea green to pale foamy green and brown. These beads are great for beach-inspired jewelry. Quartz is the most common mineral found on the surface of the earth. It is said to be a stone of power and that it can enhance thoughts. These beads feature a circular coin shape that perfectly displays the unique colors.