Once again, I confess that I haven't done a comprehensive search in the newspapers to see if Lady Alexandra Curzon every wore a jewelled tiara.
There are two occasions for which I have images of Lady Alexandra Metcalfe wearing a "tiara". The question is whether the item seen in the photos below is actually a jewel -- or a costume jewel piece? I strongly suspect that the item is a costume jewel and probably what at the time was called a "talc tiara".
1934
Detail
July 1934
Detail
In both of the cases above, it is obvious that the same headdress (tiara) is worn. To my eye it does not look like a jewel.
I have found other references to Lady Alexandra wearing hair jewels.
From the report below, we can see that she had a turquoise and diamond hair jewel -- but what was it?
1935