Fitzwilliam Tiara (& Necklace)
Unfortunately, there isn't a web page or jewellery blog dedicated for the Fitzwilliam Tiara. I only found some pictures just from google search. From some "sources" (unsure about the reliability), the Fitzwilliam Tiara was created at around 1815-1820. It has a Georgian floral structure and was made out of gold, silver and diamond.
Fitzwilliam Tiara placed in a blue background
Original source: https://www.pinterest.fr/pin/13581236364481797/
Picture of the Fitzwilliam Tiara (Bottom one) on an old display (The top one is the Primrose Tiara)
Original source: https://www.pinterest.pt/pin/516295544761390532/
Fitzwilliam Tiara placed in a white background
Original sources: https://maries-jewels-royals.blogspo...s-part-ii.html
Also found in Pinterest: https://www.pinterest.com.au/pin/50595195784086869/
The Fitzwilliam Earldom became extinct on 21st September 1979 after the death of the 10th Earl, who left no issues from his marriage. I have not found any pictures of Fitzwilliam ladies (Countess Fitzwilliam and daughters of Earls Fitzwilliam) wearing the Fitzwilliam. I can only managed to find Helena de Chair (grand-daughter of 8th Earl Fitzwilliam and daughter of Lady Juliet Tadgell (née Wentworth-Fitzwilliam)) wearing it on her wedding day in 2007. The pictures were not clear and only the Daily Mail identified the Fitzwilliam Tiara and Necklace.
Helena, as the bride wearing the tiara (sitting on the right) and her husband, Jacob Rees-Mogg (sitting on the left) [Under the Religion subheading, Cannot link the image]
A painting of Helena on her wedding day: Some parts of the Fitzwilliam Tiara and Necklace are captured [Near the bottom of the webpage, again, Cannot link the image]
The Daily Mail article that mentioned Helena de Chair wearing the Fitzwilliam Tiara and Necklace
Helena, 28, wore an ivory lace dress by British designer Ritva Westenius, set off by the Fitzwilliam diamond tiara and necklace.