You are probably right. The Countess of Wessex was visibly wearing "something" at the back of her hair at the Danish wedding in 2004, but I have found no clear image so far.
--Previous Message-- : They Countess of Wessex wore an horsehoe : brooch at the back of her hairdoo at the : danish Crown Princely Wedding. : : --Previous Message-- : Queen Margrethe has a ruby horse shoe brooch : given to her by her father when she became : heiress to the throne. The Dutch collection : has one with sapphires, given by Prince : Bernhard to Juliana for the birth of : Princess Irene. Do we know of other : horseshoe jewels in the royal collections? : : : : :