Our stones are never artificially dyed or treated The back and base are absolutely natural (basalt). Highest quality amethyst crystals extracted from Uruguay. Each amethyst geode packaged in a RIGID BOX with a cushioned interior to provide extra protection. Dimensions for each amethyst cluster (approximately) Width: 2 to 3 in x Height: 3 to 4 in. Weight 0.7 to 1 2 lb. Each piece is unique, keep in mind that the piece you will receive may have certain differences in the shape of the stone, but the same quality.