Not sure if you are talking about the small pebble stones or the water fountain large black rock. The smaller stones I purchased from either Lowes and or Home Depot. There is a combination of river pebbles, river rocks, mexican beach stones and white marble chips. The large black rock/boulder with the water coming out is a man made rock. I made it out of cement, perlite, a bonding agent and some poly-fiber for strength. I then painted it blackish. Not sure if that is what you were commenting on. Thanks.