It certainly puts paid to one of my theories. And it makes sense of one report I found from 1888 which said a parure had been given along with the fur trimmed dress.
It seems strange that none of media carried a sketch of it and that the main news outlets, like the Times, didn't mention it.
The Times report
Congratulations again! Your research has settled part of the queries I had. Now we have to try to work out when Queen Alexandra acquired the amethysts.