A crazy expensive gift.

A few months back, it was reported that Prince William gave Kate a very pricey 'push present' after the birth of their third child, Prince Louis. However, this isn't the first time he's splashed out for he also bought his wife a Cartier watch which is estimated to cost around the €5,000 mark. An eye-watering price tag when all is said and done. It's the Ballon Bleu de Cartier Stainless Steel Bracelet Watch and the Duchess of Cambridge was spotted wearing it to attend an official engagement at London's Imperial War Museum yesterday. According to Express, Prince William gave Kate the gift back in 2014 and decided to make it extra special by adding a sapphire to the face of the watch. To be fair, Kate has some stunning jewellery but one of the most-talked-about pieces has to be her engagement ring. It previously belonged to William's mum, Princess Diana and it is truly stunning. The details of the rather stunning ring are rather magnificent, a solitaire diamond and Ceylon sapphire both set in 18-karat gold. Take a look below, swoon. Prince Charles and Princess Diana became engaged in 1981 and their son asked Kate to marry him in almost thirty years later, in 2010. Oh to get a look at Kate's entire jewellery collection!