Micromosaic pendant, 19th century

rectangular, the black plaque inlaid with a waterfall beneath the Temple of Sibyl in Tivoli, within a later silver-gilt mount, crack, repairs, length approximately 26mm; a micromosaic brooch, 19th century, oval, the aventurine plaque inlaid with St Peter's Square in Rome, within a 9ct gold frame, crack to the reverse, chips, width approximately 25mm; and a micromosaic brooch, 19th century, oval, the black plaque inlaid with a depiction of a Roman temple, within a gilt-metal frame, with later metal clasp, chips to the plaque, width approximately 35mm