Abstract: The present invention discloses a manufactured stone comprising a body and an insulating core. The body has a base, an exterior portion and an interlocking mechanism. The exterior portion has an aesthetic face. The interlocking mechanism is adapted to interlock with another similar manufactured stone. The insulating core is at least partly imbedded in the body. The insulating core has a thickness sufficient to provide the body with an R-value of at least R8. The manufactured stone may also be made with a mid portion placed between the base and the exterior portion. The mid portion is recessed both from the base and the exterior portion. In that case, the R-value may be less than R8. The invention also discloses a wall structure comprising, from an interior to an exterior, a wall framing, a sheathing material and a plurality of manufactured stones. The wall framing is made of a plurality of wall studs. The wall studs are placed at a distance from each other so as to define insulating spaces in between them.