A Renaissance Revival gem-set and enamel gold necklace by Giuliano

A Renaissance Revival gem-set and enamel gold necklace by Giuliano, c.1860, centred with a cushion-shaped green zircon and set with old cushion-shaped diamonds, the openwork scroll panels with black and white enamel decoration and each suspending a pearl, the necklace with openwork foliate scroll links with conforming enamel decoration and alternately-set with circular diamond-set links, signed to reverse C.G, pearls untested, 44cm approximately