Rock tumbling is a process used to smooth and polish rough stones into shiny, beautiful gems. This is done by placing the stones in a rotating barrel with abrasive materials, such as grit and water. Over time, the friction and movement help to wear down the rough edges and surfaces of the rocks. The tumbling process typically takes several weeks and involves multiple stages, each using different grades of grit. After the final stage, the rocks are cleaned and can be displayed or used in jewelry. Rock tumbling is a popular hobby for those interested in geology and crafting.