Stunning over the top brecciated jasper cylinders. beads are 15 to 20mm in length and average 15mm in diameter. These come in strands of 4 to 5 well matched beads, depending on size of bead. Strands are around 2.75 to 3 inches long. Jasper is from the chalcedony/quartz group. It is a micro-crystalline variety of quartz that contains up to 20% foreign material. The beauty of these beads comes from the milky quartz inclusions that contrast so vibrantly with the brick red jasper.