A diamond, opal, pearl, ruby and enamel necklace, circa 1890, the detachable pendant set to the centre with a heart-shaped opal within an old brilliant-cut diamond surround, to a scroll and floral blue, white, green, yellow enamel border highlighted with old brilliant-cut diamonds and a circular-cut ruby, to a matching detachable suspensory loop and necklace with a belcher-link backchain