Large 12mm Faceted Deep-Rainbow Agate Beads - Heavy!Price is per 15 1 2 inch string of these beautiful 12mm faceted agate beads. About 28 beads to the string fantastic deep colours red, green, black, plum & blue! What is agate? Agate is nature's most striped gemstone. A variety of microcrystalline quartz that forms in layers and many colours and texture, by filling a cavity in a host rock although it is usually in round nodules with bands looking like eyes in the rings of a tree trunk. Different