A 19th century Italian Roman micromosaic Grand Tour circular table top

A 19th century Italian Roman micromosaic Grand Tour circular table top, the black marble centred with a micromosaic rondel depicting the Colosseum, within a malachite border and an outer band of specimen hardstones, including: porphyry, lapis lazuli and various marbles, 51cm diameter, on an ebonised wood and parcel gilt base with triple column supports and scroll legs, 73.9cm high (overall).