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Your Ultimate Guide To The Most Famous Royal Engagement Rings

2. Kate Middleton
Does this ring look familiar to you? Well it should, because we just talked about it!

Kate Middleton's engagement ring is incredibly special, especially to Prince William, not just for symbolizing the couple's commitment to one another, but because the ring previously belonged to William's late mother, Princess Diana. Yet, William almost didn't inherit the ring, as, after Diana's death, William actually chose her Cartier watch, and let Harry have the ring. However, when William was getting ready to propose to Kate, Harry and William exchanged items — and the rest is history!