Vintage 18kt yellow gold moving diamond and emerald bangle

Vintage 18kt yellow gold moving diamond and emerald bangle. A hinged bangle consisting of two solid tubed bangles connected to the reverse with two solid circular terminals and fitted to the front with two ridget circlar terminals set with round brilliant cut diamonds and in between the central opening a circular moving plaque set with a diamond and flanked by two rectangular plaques set with four square emerald in moving channel settings, further fitted to the outer with an additional two rectangular plaques set with four square emeralds in moving channel settings, secured by a push clasp mechanism and a hinged figure of eight safety latch.