You are right Maria Olivia, the 1st picture is indeed GDss Charlotte. Though the Lux. sisters look a lot like each other the grooms do look very different...The caption under the photo says it is Hilda and Adolf though
The diademe in the 1st picture is of Gdss Elisabet Michaelovna of Russia, who amried a Duke of Nassau. In the other 3 pictures it is less clear what tiara the bride is wearing though.