Over the years I have kept an eye open to see if any more of the tiaras spotted at the gala opera evening for the Queen's Coronation celebrations (the Gloriana opera) could be identified.
One of the more sparkling jewels was worn by Lady Alexander of Tunis, the wife of the celebrated war hero, Earl Alexander of Tunis.
A video showing guests at the opera.
Lady Alexander
There are some better views of this tiara in other videos, but I have not done still shots.
Lady Alexander was Lady Margaret Bingham, daughter of the 5th Earl of Lucan.
For the Coronation celebrations she borrowed a tiara owned by her brother, George, the 6th Earl who succeeded to the title in 1949. While, I have no definite proof at this time, I suspect that this may have been the principal tiara belonging to the family.
It was worn by Veronica Duncan, the wife of the 7th Earl for her wedding in November 1963.
Lady Lucan 1963