Kate Middleton didn't wear her engagement ring that once belonged to Princess Diana at the Royal Marsden Hospital in London on Jan. 14. Inside why and more about Princess Kate's new ring.

The Princess of Wales made a surprise return to the Royal Marsden Hospital to personally thank staff who looked after her during her cancer treatment on Tuesday.Kate spoke to workers and patients at the London hospital in an important moment in her “personal journey” four months after confirming she was cancer-free.

Pretty much every second of Kate's visit was analyzed, and fans just noticed that she wasn't wearing her iconic diamond and sapphire engagement ring. But real quick before you sta

Kate Middleton visited the Royal Marsden Hospital in London on Tuesday, Jan. 14, where she received chemotherapy treatment after her cancer diagnosis last year. See all the photos here

Middleton’s famous 12-carat diamond and sapphire engagement ring (you know, the one that used to belong to Prince William‘s late mother, Princess Diana) was MIA. And yes, this

Princess Kate made her first solo official appearance in more than a year as she visited the Royal Marsden Hospital in London to thank staff for her care

Kate Middleton just became an official patron of the hospital where she received preventative chemotherapy treatment, marking her first royal engagement of the year. During the outing, Kate visited with patients at the Royal Marsden Hospital,