This antique ring has a blue zircon and diamonds set in platinum.  The zircon is set in an illusion heat setting with triple split prongs.  The zircon is approximately 0.93ct.  There are three single-cut diamonds on each side of the zircon.  The diamonds are bead set.  The vintage ring is Ca.1930.  It is a size 5.5 and can be sized if needed.  $1,650.