Pebbles are small, smooth stones that are typically found along the shores of rivers, lakes, and oceans. They are formed through the natural process of erosion, as larger rocks and boulders are broken down over time. Pebbles come in various shapes, sizes, and colors, ranging from tiny grains to palm-sized stones. Pebbles can also be made from marble, granite or any other stone and processed in a factory inside a tumbler to make it look more beautiful.