Recently, the princess had swapped the famous jewel out for a ring stack. After announcing the end of her chemotherapy treatment in September, Kate Middleton has slowly returned to public life. This past Saturday,

In fact, until this past weekend, Kate hadn't worn her engagement ring in any public appearance—or any images or videos shared on Kensington Palace's social media channels—since attending the Wimbledon men's finals in July with her sister, Pippa, and her daughter, Princess Charlotte.