Thijs,as to your last but one post,the diademe of Grandduchess Alexandrine in the pic in one of the posts above,looks very much if not exactly like the Pearl diademe as worn by Princess Marianne?
And as for the portrait of the young and beautifull Marianne being in the possession of Queen Sophie,well,that's a surprise,as Queen Sophie loathed Marianne due to her lifestyle,and as she wrote to her friend Lady Malet;"Princess Marianne visited The Netherlands,but ofcourse I kept my door closed for her"....Odd isn't it?