A worktop (1) for pieces of furniture includes two slabs (3, 4) made of stone, arranged so that they are adjacent to each other at the level of corresponding head surfaces (5, 6) in order to define a work surface (2) exposed to the outside. A joining arrangement is suited to stably connect the slabs (3, 4) and includes a first bonding substance (8) interposed between the head surfaces (5, 6) and recesses (9) obtained on the head surfaces (5, 6) of each slab (3, 4), mutually facing each other and configured in such a way as to define corresponding housings completely delimited in the direction of the thickness of the slabs (3, 4), the first bonding substance (8) being spread mainly in the housings.