The Crown Prince of Norway's Wedding: HRH The Countess of Wessex
The British tiara on display at CP Haakon's wedding is the Wessex Wedding Tiara, a tiara worn first by Sophie Wessex on her wedding day, but made of antique elements.
Royal watchers have determined that this particular sparkler is composed of four anthemions (also called "palmettes" -- like the little sections of palmette tiaras) that were once a part of Queen Victoria's Regal Circlet diadem. If you look closely, you can see the four pieces -- one on each side, and two sort of stacked together in the middle.
I quite like this tiara, but what I really love is this solution to the problem of finding tiaras for new, more minor members of royal families. You don't want to give them the big, heirloom pieces -- because they'll eventually probably leave the family that way -- but this way, you can use sections of older jewels that probably aren't suitable for modern wear but have great historical provenance. Bravo on this one, Brits! 
She looks really good here - the tiara really suits her. Quite suitable for the low-key Wessex girl
I must say I've never really been a fan of this tiara - whilst the idea of pulling it together is a good one, close up the pieces are a bit clunky, and the top anthemion in the middle is literally plonked on top of the other one, and it shows. Also, I am not keen on the way it has been mounted on wire to stand above the hair - the wires show up...
Moans aside, Soph looks nice here - that's a nice blue on her.
He he- the outer points look like those plastic bunny ears popping out of Soph's head!!
No, I actually really like this ensemble. She looks very pretty.
Nah, doesn't do it for me at all. Never likes the tiara, and the blue is too much on her.