Art Deco oval diamond and sapphire target ring in platinum

Art Deco oval diamond and sapphire target ring in platinum. Set with an estimated 0.50ct oval Old Mine cut diamond in a raised rubover setting, encircled by a row of callibre cut sapphires in channel settings, further enhanced by a row of round old cut diamonds in grain settings, to a double row target design with millgrain highlights and elaborately pierced gallery, flanked to either side with diamond set shoulders which smooth to a slim shank. Hallmarked platinum, French.