A fine 19th century Italian micro mosaic roundel in a gilded wooden frame, featuring a pair of figures in the Roman Forum with the dome of St Peter's to the left of the horizon within a narrow band of malachite and black marble, 35 cm diameter, the frame 53 cm square. Note: The decorative qualities of marble have been admired since antiquity, with the Greeks mining extensively for white Pentelicus marble for use in sculpture and architecture, while the Romans favoured the naturally polychromatic types, found in the Gallic territories.