Concrete is a human-made agglomerate of a filler (usually sand), a binder (nowadays usually Portland cement, the Romans used lime) and an aggregate (gravel, cr

Concrete is a human-made agglomerate of a filler (usually sand), a binder (nowadays usually Portland cement, the Romans used lime) and an aggregate (gravel, crushed granite, crushed old concrete, ...) which cures to a solid. It can be poured as a slurry, formed as a paste, dry-pressed and hydrated (concrete roof tiles are made this way), sprayed, injected and more - i.e. it is a versatile material. The difference between cement and concrete is the difference between boiled linseed oil and paint in that cement is the binder for making concrete while boiled linseed oil is the binder for (traditional) paint. It is what keeps the other ingredients (filler and aggregate for concrete, pigments for paint) together. Stone is a portmanteau for the material from which rock is made, this can include sedimentary conglomerates like sandstone, metamorphics like soapstone, igneous extrusives like basalt, igneous intrusives like granite and more. In short, it is the hard mineral stuff rocks are made off. The "setting" you refer to is the time it takes for the binder(s) to react to produce the final agglomerate, not the shape into which it sets. It would be possible to shape basalt by pouring lava (i.e. molten rock) into a heat-resistant form, going from hot to cold to create the final product. It is also possible to sinter ceramics at high temperature in some desired form, going from cold to hot to cold. Since there are no ovens big enough to sinter buildings this tends to be limited to smaller parts, e.g. refractive (heat-resistant) stones for building hearths etc.