Magnificent 15mm Desert Fire Agate Rondelle Beads - Big & Very Heavy!Price is per 15 inch string of these vibrant beads. Big & heavy with a beautiful sheen! About 32 large rondelles to the string each measures 15mm x 12mm. No gemstone is more creatively striped by nature than agate, chalcedony quartz that forms in concentric layers in a wide variety of colours and textures. Each individual agate forms by filling a cavity in host rock. As a result, agate often is found as a round nodule, with concentric bands like the