Like Franck, who has tried to find information on these for some time, I would also like to either see or have more information on the two sapphire tiaras which Leslie Field says are in QEII's collection, but not worn.

There are many possibilities.

Could Field be mistaken?

Could one of them possibly be the tiara worn by Princess Margaret and Queen Mary which had a large sapphire brooch in the centre? (the brooch having later been in Princess Margaret's collection)