Wait, Did Kate Middleton Wear Her Engagement Ring While Scuba Diving?

Royal fans are starting to believe that Kate Middleton wore a fake—yes, fake—version of her blue sapphire engagement ring during a recent royal outing.

This week, the Duchess of Cambridge embarked on a royal tour of the Caribbean alongside her husband, Prince William. In Belize, the couple suited up in scuba diving gear and went swimming at South Water Caye.

Prince William and Middleton shared a video of the excursion on their joint Instagram account, featuring underwater footage of their diving experience. It didn’t take long for outlets (like The Daily Mail) to share screenshots of Middleton, who seemingly wore her engagement ring in the ocean.

This would be a shocking revelation. Not only is the ring worth around $395,000, but it’s also a family heirloom. (FYI, it formerly belonged to Princess Diana.) But since the video is too blurry to confirm it’s *the* ring, fans are speculating about other possibilities.