This post has three new things: a new royal (Princess Marina of Savoy, the Princess of Naples), a new tiara (Queen Margherita's Musy Tiara), and a royal wearing a tiara with sunglasses. That last one is definitely a blog first, I think!
Princess Marina would be Queen of Italy had the Italians not booted out their monarchy a generation ago, and her tiara is one that's certainly fit for a queen. It was made for Queen Margherita, who was queen of the newly-unified Italy from 1878 to 1900, by Musy. It's a versatile tiara that can be worn in various configurations, and it's super intricate.
(But the tiara isn't my favorite thing named after Margherita -- that would be margherita pizza. Yuuuuuum!)