A late 19th/early 20th century diamond and gem bird brooch

A late 19th/early 20th century diamond and gem bird brooch
The exotic bird with rose-cut diamond, ruby and emerald wing and feather detail the head with emerald crest, rose-cut diamond eye and engraved naturalistic decoration, perched on a crescent-shaped blister pearl with diamond berry, circa 1900, please note that the pearl has not been tested for natural origin