On the Dutch Royal Jewel site there are numerous photos of various royal ladies wearing the spectacular Diamond Bandeau.
I noticed that, while most times the tiara is worn in a halo style, in photos from 2013 Queen Maxima, then still Princess, wore it with a curved shape. Queen Juliana, then Princess, also wore it with a curved shape in 1937. Please scroll through the following link - http://www.dutchroyaljewels.nl/Diamond_Bandeau_Tiara.htm to see various photos.
The diamonds are said to be mounted on a light platinum wire frame.
Is the frame flexible or are there two tiara frames for this set of diamonds?