In Chile, March 15, 2013, Princess Mary wore 3 layered disk pendants:
http://static1.purepeople.com/articles/9/11/73/29/@/1077714-crown-prince-frederik-and-crown-620x0-2.jpg
The longest chain has a disk engraved with c, the middle one with i and the shortest chain, hard to tell. I can't even...