The Duchess of Cambridge’s stylish engagement ring formerly belonged to Princess Diana. It was Prince William’s way of including his mother on his wedding day. Rumor has it, however, that the ring was in Prince Harry’s possession first. Reportedly, following their mother’s tragic passing, both princes were encouraged to keep one item from her personal collection as a treasured memento. While Harry selected the sapphire engagement ring, William opted for a gold Cartier watch; later, when William expressed his intention to marry Kate, the brothers exchanged items.