Tumbled Marble Mosaic Tile 3/8-Inch is cut from natural stone of various types and tumbled for a matte finish. Sold loose by the pound. The small size makes it possible to make detailed mosaic designs with little or no cutting. This is important because cutting can mar the finish of tumbled mosaic marble, and stone usually does not break as cleanly or as predictably as ceramic or glass mosaic tile. The 3/8-inch size is nominal only, and significant variation occurs between types of stone. Some batches of stone are softer than others and tumble to a smaller size with more rounded corners. There is also variation in pattern and color between different batches of stone. Click on a color to see the full product description.