These 3-4 inch Agate Coasters are fashioned from the highest quality stone and their edges have been left unfinished, for a natural look. Each piece is unique and shapes, colors and patterns vary, but yours will resemble the pictured examples. This natural product has been enhanced with artificial dyes. Some of these colors-Espcially the brightest colors-may bleed out of the stone slightly when wet. It is recommended that the coastes should be soaked in warm water to remove excess dye before use to help prevent the possible staining of porous surfaces.