My guesses for other tiara events this month:
State visit from Indonesia to the Netherlands :
Maxima: antique pearl tiara
Beatrix: pearl button tiara
State visit from China to Spain:
Letizia: floral tiara
There is no State Visit from Indonesia to the Netherlands:
14 November
Official visit by the President of Austria
- lunch offered by the King at Noordeinde Palace (suit)
- banquet offered by the Prime Minister at the Catshuis (black tie)
Most likely the royals will be in London for the Prince of Wales' birthday.
20 November
State Visit by the President of Singapore
- State Banquet offered by the King at the Royal Palace (white tie, I think)
My guess: Queen Máxima with the bandeau and the Borneo Suite
My guess: Princess Beatrix with Queen Emma's floral motif diadem and other diamond jewelry
21 November
State Visit by the President of Singapore
- Banquet offered by the Prime Minister in the Trêves Chamber of the Inner Court (black tie, I think)
My guess: no diadems but a nice display of other jewels
11 December
State Visit by the President of Cape Verde
- no program known yet