... 1,Natural stone 2,Polished river stone 3,Black river stone 4,size : 2-3cm/3-5cm ... factory is loated in Luhe ,Nanjing --the hometown of River STONE ,where is convenient to NANJING and SHANGHAI port ... have developed many other products ,such as nature pebble stones ,river stones ,color stones ,color sand ,machine-made stone ,pebble tiles ... for construction ,decoration ,and landscape . high river stone