This package of assorted gemstones provides an excellent collection of tumbling materials. Included rocks are of 6.5 to 7 hardness and varying size. You may discover such gems as bloodstone, rose quartz, amethyst, tiger's eye, red and green jaspers, and more. While the size of stones will vary, most in the package are about 1.5 inches in diameter. Break them into smaller pieces if desired. Happy tumbling!