A late 19th century peridot, enamel and diamond pendant, Carlo Giuliano, circa 1880, The pierced quatrefoil plaque decorated with white and blue champlevé enamel, set centrally with an octagonal peridot, within a red enamelled bead and rose-cut diamond floral surround, terminating in a trapezoid-cut peridot drop with rose-cut diamond and seed pearl embellishment, blue champlevé enamel decoration to the reverse, suspended from an associated fine trace-link chain set at intervals with seed...