I have checked in my exemplar of Munn, and I now realized I have made a confusion with the Pakenham Tiara (illustrated in the "mega-Munn", page 58-59):
Both tiaras have a design based on scroll and palmette motifs, which may explain my confusion.
Or maybe I have already seen the diamond tiara worn by the wife of the Lord Mayor elsewhere (possibly on the website of an auction house?). I have to look further.
--Previous Message-- : : Arthur - you might have been thinking of a : tiara with stars on stalks? I waited until I : saw a clear enough view. : : : : : -part of -Previous Message : : Wasn't the tiara worn by the wife of the : Lord-Mayor of London pictured in Geoffrey : Munn's book Tiaras - A History of Splendour : ? :