An emerald, diamond and pearl necklace

細節
An emerald, diamond and pearl necklace
Composed of three graduated clusters, each centrally set with a rectangular-cut emerald within a surround of old-cut diamonds, separated by a trefoil cluster of similarly-cut diamonds suspending a knife-edge bar with pearl terminal, a pearl with diamond-set cap suspended from the principal cluster, the whole mounted in silver and gold, to a later back chain each cluster detachable