You missed several british tiara! Sophie had a small floral button tiara to Fred-Mary pre wedding gala. Queen Mum also had the Teck Circlet that can be a necklace and a tiara. It's the one I like for Harry's FD. And Anne has this mystery tiara photographed once on her 21st official bday portrait. I think it was a pearl-diamond festoon tiara. I think HM had the largest collection of tiaras and jewelries. She just doesnt use them alot.
I didn’t include the tiaras you mentioned in the list because they don’t belong to Queen Elizabeth II or her descendants.
The tiara worn by the Countess of Wessex at the wedding of Crown Prince Frederick and Crown Princess Mary of Denmark in May 2004 was a loan from a jeweller. Ayvee Eliot from Diana’s Jewels was able to track down the tiara (which was originally a necklace) to Kentshire Galleries in New York, where it was on consignment from a London jeweller.
The Teck Hoop Necklace Tiara which was worn by the Queen Mum as a tiara and Princess Margaret as a necklace is now in the possession of David and Serena Armstrong Jones, the Earl and Countess of Snowdon, so there is no chance is will be worn by Prince Harry’s future wife.
The mystery tiara worn by Princess Anne as part of the gorgeous 21st birthday series taken by Norman Parkinson has always bugged the heck out of me. It was most likely a one time loan as we’ve never seen it again but I don’t really know anything about it.