Brazilian Polished Edge Agate Drink Coasters Set of 4 (Blue) Premium Quality, Polished One-of-a-Kind Natural Brazilian Agate Slices Each coaster is unique due to naturally occurring color & pattern variations Photos represent only a few selected samples - NO Two Slices Alike! Rubber bumpers & Certified Agate information card included Cut & Polished to Create Rounded Edges; Diameter 4"