I think it's the emerald tiara of the parure but without the clusters.
--Previous Message-- : There was no conclusion. She herself wrote she : wore her emeralds, but the tiara of the : emerald parure does not match the tiara she : wore. The central motiv of the mystery tiara : is a dark stone and most likely an emerald : (she is wearing emeralds in her other jewels : and she described them as such in her : memoires). : : --Previous Message-- : Since Princess Wilhelmina is wearing a suite : of diamond-and-emerald jewelry, I wonder if : the mystery around that unknown diadem has : now been solved? : I don't remember if there was a conclusion : on this board about the diadem worn by : Princess Wilhelmina on this photo from 1958: : : : : : :