1880s rectangular plaque ring set with moonstones and diamonds

1880s rectangular plaque ring set with moonstones and diamonds in 18kt rose gold, centred with two vertical rows of eight round moonstones in grain settings, surrounded and flanked by round Old European cut diamonds in grain settings, to a show stopping rectangular cluster ring with matching chatoyancy in the eight moonstones and pierced scrolling gallery, the open trumpeting shoulders feature diamond embellishments and millegrain borders which smooth to a solid shank. Marked 18kt gold.