I wish there was more information available. Has anyone read the book Pearls?

I found a few more photos. One gives a better view of the tiara as worn by the Lady Mayoress at the Guildhall banquet for President Putin.



I found photos showing the Lady Mayoress wearing the tiara at another banquet (for Tony Blair) in 2002.

I haven't done enlargements, but they also give good views of the tiara.