 The Monégasque royals are famed for their exquisite jewellery, and Grace Kellys enormous engagement ring is a legendary piece of jewellery. So it was only fitting that Prince Albert of Monaco selected a stunning ring for his future wife Charlene Wittstock in 2010, who is celebrating her 45th birthday today. Princess Charlene of Monacos beautiful ... Princess Charlene rarely wears 55,000 engagement ring ... 