Queen Elizabeth II was the longest-serving British monarch in history. At the link in our bio, we take a look back at perhaps the greatest personal collection of jewels in the world, none were so valuable to the Queen as those that were designed by and given to her by her husband, the late Duke of Edinburgh. Over the course of their 73-year marriage, Philip designed and purchased numerous gifts of jewellery for the Queen, and his unique designs often reflected deeply personal references to their relationship.