The image I posted of Queen Alexandra was, I believe taken in 1908, and is a detail from photos taken at the State Opening of Parliament.
Visually, the arrangement of diamonds in front of Queen Victoria's small diamond crown seems to correspond with a description of part of a form of headdress worn by Queen Alexandra to the opera in 1905.
I suspect that the diamonds in front of QV's small crown may be those worn at Queen Alexandra's throat for the Opening of Parliament in 1901, but I am not certain of that.
[Edit: I now recollect that Queen Alexandra wore Queen Victoria's fringe brooch (aka waterfall brooch) at her throat for the first Opening of Parliament by Edward VII. I am not certain when the photo below of Queen Alexandra was taken as I don't think the newspaper gave a date.]