Pink Spinel/Iolite w/ Clear Spinel Multi Stack Vintage Ring w/ 925 Silver & Gold

Vintage 925 stacked sterling silver ring with pale pink pear faceted stone that tests in the range of Iolite and Spinel on PGT II and clear gemstones set 3 different bars. All clear Stones test in range of Spinel on PGT II. Gold Plated on two bars. Have not identified type of gold plate. Unable to identify hallmarked signature; see photo. Size US 9 3/4 Prong setting and split shank.