Kate Middleton wore her new eternity ring in her announcement about completing chemo instead of her engagement ring that once belonged to Princess Diana. Lauren Kiehna of The Court Jeweller exclusively speaks to PEOPLE about the ring.

In the joyful video announcing the end of her chemotherapy treatment for cancer, Kate Middleton and her family dress smartly but casually, playing in nature on a sunny day. And in addition to her boho chic white dress,

The Princess of Wales replaced Princess Diana's sapphire engagement ring with a more understated eternity ring, reportedly gifted to her by Prince William, in a recent family video where she shared a cancer update.

Eagle-eyed viewers have identified a new addition to Princess Kate's jewellery collection as she celebrates the end of her chemotherapy treatment - and it's beautiful

Kate Middleton appears to have swapped her iconic engagement ring, which once belonged to Princess Diana, for a new eternity band, eagle-eyed royal fans have spotted

Eagle-eyed viewers have spotted an unfamiliar eternity band on the princess’s ring finger. Is it a blast from the past or a new acquisition?