When it comes to the British royals, we're not often treated ... and as usual, they pulled out all the stops in the tiara department. Queen Silvia led the way, wearing a show-stopping diamond ...

However, what really stole the show was Mary's emerald and diamond-encrusted tiara. The headpiece in question is the Danish Emerald Parure tiara – a jewel that is typically reserved for the queen.

Amidst all the drinks and caviars ... She also added a large emerald and diamond brooch with a diamond buckle and chose the Queen Mary’s Honeysuckle Tiara with a beautiful emerald and diamond ...