I would love to see the too-rarely-seen emerald parure of the Bernadotte collection. The best tiara matching with this parure is in my opinion the Nine-Prong tiara.
Queen Silvia has worn this parure only once for the Nobel ceremony (in 1987):
As far as I know, the last public appearance of the parure was at the Nobel ceremony in 2012, worn by Crown Princess Victoria:
I would also be very glad if Queen Silvia or Crown Princess Victoria decided to give a glorious outing to the newly rediscovered Queen Victoria's corsage brooch, which Queen Silvia recently wore for the first time in Germany: