It could very well be the central stone, I think she also has worn the brooch with a saphire pendant.
--Previous Message-- : I have a theory about princess Margriet's : diamond pendant as worn during the Italian : state visit last October. : : Many believe the tiara belonging to the : wedding parure has been broken up. The : central stone is a cushion shaped diamond : that has not yet been accounted for in the : jewelry the four daughters of Juliana had : made during the 1960s. : : Could it be, that the diamond pendant is the : central stone? It's shape seems to : correspond. : : : (posted by Gert-Jan, : http://members2.boardhost.com/royal-jewels/msg/1351078058.html : ) : : : (courtesy : http://http://www.royal-magazin.de/niederlande/saphire.html : ) :