Stone gives a light fitting weight, literally and visually, and ties it to the rest of a room's materials: a marble worktop, a stone floor, a fireplace surround.
Italamp's Regolo rests a single sphere of marble on a level bar, Calacatta gold or black Marquinia depending on the finish, across a linear pendant, a floor lamp and wall lights, so the same stone can run through a scheme. Masiero's Honice sets slabs of natural onyx around a gold band and washes them with light. Natural stone varies in veining and tone from one block to the next, so each piece will differ from the photographs.