An Art Deco ruby and diamond double cluster ring

An Art Deco ruby and diamond square cluster ring, the central rectangular step-cut ruby estimated to weigh 1ct, set to the centre of an old-cut diamond cluster surround, all within a border of calibre-cut rubies, set in platinum with ornate scroll-design pierced gallery, to a square-section platinum shank with diamond-set shoulders, circa 1930, gross weight 4.2 grams,

No. 20392M