In a post above Mauriz mentioned the Scarsdale jewels and not finding photos of any of the ladies wearing significant jewels. Sadly for us, none of the photographic agencies appear to have any photos of the ladies from this family wearing grand jewels.
However, there are some photos in the UK press of the wives of the successor to the titles of Scarsdale after the death of the Marquess of Curzon in 1925.
There are no photos of any Lady Scarsdale prior to then as, after the death of Blanche, Lady Scarsdale (the mother of the Marquess of Curzon) in 1875, there was technically no Lady Scarsdale until the Marquess of Curzon married his second wife, Grace in 1917 following the death of his father, Baron Scarsdale in 1916.
The complexities (and hierarchy) of titles given to George Curzon, 1st Marquess of Curzon, meant that his second wife, Grace, was never referred to as Lady Scarsdale.
I don't know if she was ever photographed wearing any of the heirlooms of the Scarsdale family, as I haven't followed her in the UK press.
What I can show are jewels worn by the wives of the 2nd Viscount Scarsdale. He was the heir to the titles Viscount Scarsdale (created for the Marquess of Curzon) and the title of Baron Scarsdale which had been held by the Marquess' father and other forebears.
The first wife of the 2nd Viscount (who acceded to the title following the death of his uncle, the Marquess of Curzon) was Mildred Dunbar. The couple divorced in 1946.
Lady Scarsdale (Mildred)
1932 at the Opening of Parliament
1935
1935
1929
1929 detail
The second wife of the 2nd Viscount, Ottilie Pretzik, wore the tiara as a necklace.
1950
1953
It seems to me that these elements could be mounted either as a necklace or a tiara, and when worn as a tiara that the central 3 elements were mounted side ways on a frame. As worn as a necklace by the 2nd Lady Scarsdale the elements were all positioned in the same orientation on a necklace base/chain.
I have wondered if these elements might be the "star tiara" referred to by Mary Curzon in her will, but I have no proof, and the only thing suggesting a star are the cross shaped elements in the centre of the oval elements. The elements in the jewel worn by both Viscountess do not seem to be a modern jewel. Another little mystery for us to solve.