A group of early 20th century jewellery

A group of early 20th century jewellery
Comprising: a diamond single-stone ring with single-cut diamond shoulders, finger size K; a rectangular emerald ring with trapezoid-shaped diamond shoulders, finger size K½; a dress ring set with three old brilliant-cut diamond collets within a pierced geometric surround, finger size K; and a pendant set with a single old brilliant-cut diamond to a rose-cut diamond foliate and bow surmount, on a trace link chain, 39.2cm long