When I did research on the jewels of Lady Irene Curzon, Baroness Ravensdale some time ago I posted only a small amount about her her jewels.
Now I have forgotten a great deal of the information which was in my mind at the time -- but I'll try to reconstruct it all. (Perhaps I will fail, so I ask for caution in using my comments)
I think that the tiara worn by Lady Ravensdale for the 1937 coronation, and later in the social season that year, is/was a jewel. But whether Baroness Ravensdale owned that jewel or hired it is something I don't have information on.
1937 Coronation photo
Later in the "Season" in 1937
Other head jewels worn by Irene, Baroness Ravensdale.
I suspect that most of these are costume jewels, but it will take me time to go back over my notes and cuttings to work it all out. Can I say that, I am not guaranteeing to do this soon, as my current
schedule is busy.
The Baroness was noted for wearing so called "talc tiaras" and some costume jewellery. I think that the items seen below might fit into that category, but I have not double checked.