A mid/late 18th century gem-set and enamel masquerade ring

A mid / late 18th century gem-set and enamel masquerade ring, the oval concave plaque enamelled female face with masked diamond-set eyes, beauty spots and red bow lips, within a surround of channel-set calibré-cut garnets, to the yellow gold plain swivel shank (possibly later) ring size H, 4.6g Condition: As per the description shank possibly later, enamel loss from nose and possibly from brow - first hand inspection advised.