Key Takeaways Kate Middleton just debuted her largest ring stack to date. The five-ring stack includes her engagement ring, as well as four sentimental bands. During her appearance at the ladies' singles finals at Wimbledon this July, she donned three sentimental bands, as well as her well-known engagement ring. Max Mumby/Indigo / Contributor / Getty ImagesAll of the Details on Kate Middleton's 5-Ring StackThe five-ring stack features her engagement ring and four sentimental bands. While Kate's engagement ring may be the most famous in the stack, the other four bands are just as meaningful to the princess.