Pebble stones are small, naturally rounded pieces of rock that are typically found on beaches, riverbeds, and along the shores of lakes. Their smooth and rounded appearance is the result of a natural tumbling process, where water currents and waves continuously roll them over sand and other rocks, gradually wearing down their sharp edges and corners over time. Pebble stones can vary widely in size, color, texture, and mineral composition, depending on their geological origin and the type of rock they are derived from.