Kate Middleton doesn't always wear the sapphire and diamond engagement ring that was once worn by her late mother-in-law Princess Diana, and there is a standout reason why.

The item resembles similar pieces belonging to other medieval religious leaders, such as a large sapphire, ruby and emerald ring owned by the 13th-century archbishop Walter de Gray. In recent ...

That said, it’s hard not to also see the overlap between Eugenie’s engagement ring and Princess Diana’s—now worn by Kate Middleton—given it also included a large sapphire at the center with a halo of ...