French Art Deco Old European and Old Mine cut diamond plaque ring

French Art Deco Old European and Old Mine cut diamond plaque ring. Centred with an estimated 1.00ct round Old European cut diamond in a rubover setting, flanked by six cushion shape Old Mine cut diamonds in grain settings, to a plaque cluster ring featuring polished borders and centre, decorated with a solid engraved gallery and met to either side with slightly trumpeting shoulders which smooth to a solid shank. Estimated total diamond weight 2.60cts. Hallmarked platinum, French.