Three gem set rings, late 19th to early 20th century

One star-set with circular-cut emeralds, sapphires and rubies and a brilliant-cut diamond, size K, French assay mark and maker’s mark; one with scrolling motifs set with circular- and single-cut diamonds, size Q, French import assay marks; and one set with a pearl between rose-cut diamond shoulders, size J^1/2, French import assay marks.