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Queen Mary. Perhaps another query resolved.Archived Message
Kongetro found other images (see RJWMB link) which led to the conclusion that Queen Mary wore the Lovers Knot tiara, although I am left with the impression that not everyone's queries/impressions were solved.
Since that discussion I found a series of photos in the Sphere 19 May 1934.
I think that taken in conjunction with the other images Kongetro found that we can conclude that Queen Mary was wearing the Lovers Knot tiara without the pearl surmounts. The impression that there were uprights on the top line of the tiara has been created by light bouncing off the diamonds which now form the top line of the tiara.