Thanks ! I will remember Grand Duchess Constantine (the younger)'s nickname is Mavra.
Yes. I think Miechen had a bigger collection since she did bought so much from Cartier. Not to mention to those she got her daughter Ellen.
I think of all the pieces owned by Ella, the ones that made the most impression on me were the emerald parure (the tiara, necklace and brooch set), The diamond and pearl tiara, the diamond link necklace (which may or may not be the one given to her niece Marie Paulovna, since some claim hers was a copy). The fleur de lys brooch and the aquamarine tiara (which was returned to Hesse). Didn't know if she over owned a Russian diamond fringe tiara or rubies & sapphires.