Tumbled stones are polished by putting them in a tumbler with grit such as sand for a long time! The process smooths and polishes the stones. Tumbled stones are wonderful to use in healing layouts or to carry in your pocket. They make great gifts, especially for children. The Sea Goddess has many, many types of tumbled stones.
A partial list is Amethyst, Red Jasper, Carnelian, Citrine, Malachite, Aventurine, Blue Lace Agate, Sodalite, Clear Quartz, Tigers Eye, Rhodochrosite, Fluorite, Moonstone, Bloodstone, Aquamarine, Emerald, Hematite and many more. The usual cost for these stones is 50 cents for medium sized (about 1") and $1 for large size. Email me for answers to specific questions about tumbled stone. I have pictured some Blue Lace Agate here.