Dirt On Demand CRST-FL-1900 3/4" Limerock #57 - Made from carefully broken down limestone rocks, this limerock is a lighter and more modeable gravel type. Featuring a classic and uniform look, limestone gravel is the perfect way to help your yard look its best. It also great for driveways and drainage applications. Use limestone gravel in any visible area of your yard to fight unwanted weed growth or to create a beautiful pathway.