Many thanks for this insight Mauriz. I had been trying to visualise how the system you describe works. Finally comprehension came! I learn something new each time.
--Previous Message-- : The impression that the central motif has : another position when worn as a tiara might : have to do with the fact that the back part : of the necklace seems to be added to the : base of the tiara which is apparent in the : photo malluu posted a bit further up. : : I assume this chain runs behind the central : element but is visible on both sides, thus : altering the proportions. : : :