Princess Diana’s extravagant engagement ring, which is 12-carat Ceylon sapphire, is adorned with a cluster of 14 diamond sets ...

Princess Diana picked her 12-carat sapphire and diamond engagement ring. Prince William proposed to Kate Middleton with the same ring.

Just ask Crown Princess Victoria of Sweden. The heir to the Swedish throne most recently paired an ornate, 119-year-old diamond tiara with a dress from the most surprisingly accessible brand.