22 Large 16mm Gleaming Agate Chunky Button Beads - looks like marble!Price is for 14 inch string of these quality, striking beads. About 22 beads to the string each measures a large 16mm x 6mm. Drilled as in picture. What is agate? Agate is for mental energy and study. 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