Kate Middleton Trades Princess Diana's Engagement Ring for 'Sparkling' New Eternity Band in Latest Video

The Princess of Wales has some new bling on her finger, and Lauren Kiehna of The Court Jeweller breaks it down for PEOPLE

Kate Middleton wore what appears to be a new eternity band again in a video announcing she has completed chemotherapy treatment.

The Princess of Wales, 42, shared the news about her health in a Sept. 9 video featuring family footage of her and husband Prince William exploring the outdoors with their children Prince George, 11, Princess Charlotte, 9, and Prince Louis, 6. In the intimate clip, which was filmed by Will Warr in Norfolk in August, Princess Kate sported what looks like the same eternity band of dark gems and diamonds she debuted in an August video with William — a hypothesis one expert verifies.

"The ring that Kate wore is definitely a newer addition to her jewelry box. It's a slim, sparkling eternity-style band with alternating light and dark gemstones," Lauren Kiehna, founder of The Court Jeweller blog, tells PEOPLE. Kate was first spotted wearing the ring in an Aug. 11 video in which she and William congratulated Great Britain on their success at the 2024 Paris Olympics.

Related: Prince William Gives Update on Kate Middleton's Health: 'Good News' but 'Still a Long Way to Go'

The Princess of Wales styled the eternity band the same way across both the August and September videos, stacking it with what looks like her Welsh gold wedding band and the white gold and diamond Annoushka ring she started wearing shortly after the birth of their first child, Prince George, in 2013, widely believed to be a gift from Prince William.

"Many of these eternity bands reflect family relationships. Given that her children's birthstones are rubies, emeralds and diamonds, it wouldn't surprise me if the gems set in the new ring are linked to George, Charlotte and Louis," Kiehna says about what the accessory's deeper meaning may be.

Missing in both instances was her 18-carat sapphire engagement ring that previously belonged to Princess Diana, which William proposed with in 2010 to keep his late mother "close to it all." Giving context around why Princess Kate may have removed her megawatt engagement ring, Kiehna notes that "royal women wear their engagement rings in different ways, just like the rest of us." 

Related: Kate Middleton and Prince William Change Profile Photos on Social Media as She Completes Chemo

"Some, like Queen Elizabeth, wear their engagement rings daily for their entire lives. Others, like Queen Mathilde and Queen Mary, switch out their engagement rings for other rings on a regular basis. And some, like Queen Letizia, haven't been spotted wearing their engagement rings for years," she says.

"The two videos showing Kate wearing the new eternity band were both filmed in casual, private moments. It wouldn't surprise me if she sometimes chooses not to wear her most important jewels in those kinds of settings, reserving her grander engagement ring for more public occasions," the writer and historian speculates.

Some wondered if the eternity band Kate debuted in the Aug. 11 video was the same piece of jewelry as the "promise ring" she reportedly received from Prince William while they were dating, but a closer look shows it is clearly not.

The new ring in her jewelry box features larger gems on a bigger band, while the sentimental memento said to be from William has only a few stones.

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Fan blog Dress Like a Duchess previously reported that Prince William gave Kate a rose gold ring with her birthstone, garnets and his June birthstone, pearls, during their courtship. The future princess slipped it on for graduation from the University of St. Andrews in 2005 and has been photographed in it rarely since.

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