Early Art Deco diamond three stone bombe cluster ring

Early Art Deco diamond three stone bombe cluster ring in platinum and 18kt yellow gold. Centred with an estimated 0.75ct round Old European cut diamond in platinum millegrain setting, flanked by two round Old European cut diamonds in grain settings, surrounded by cushion shape Old Mine cut diamonds in grain settings and decorated with rose cut diamonds in grain settings, to an openwork bombe cluster with millegrain borders and pierced gallery supported by fine cheniers and met to either side with trumpeting shoulders which taper to a subtly incised shank.