Princess Diana’s famous engagement ring has been given to Prince William’s longtime girlfriend Kate Middleton … and this is strangely odd because the ring never belonged to William at all.

After Diana’s 1997 death, her sons Princes William and Harry were taken to Kensington -- the palace where Di resided -- by their father Prince Charles. Harry chose to take Di’s sapphire engagement ring as a memento of his mother; William took the Cartier watch she used to teach him how to tell time. Now, the ring graces the finger of Prince William’s fiancee (and the soon-to-be Princess of Wales).

Insiders say Prince Harry gladly gave the ring to his brother, as it is only fitting that the wife of England’s future king wear the ring that once graced Princess Diana’s finger.

Diana stopped wearing the ring when it became public that Prince Charles was having an extramarital affair, which led to tons of bad publicity for the royal family.

While being hounded by reporters one night, Diana tragically died in an automobile accident.

The ring, an 18-carat oval sapphire set in 18k white gold, is surrounded by 14 rounds of diamonds. It cost over $40,000 when Prince Charles gave it to his intended bride in 1981.

Today, the ring worn by both England’s favorite princess and future princess is considered priceless.