The Country Mouse & City Mouse Adventures appeared for a brief time a few years back on CBS, but before that, the series aired on HBO Family for 3 seasons, spread over the course of a year and a half.
The titular rodents are a pair of cousins who travel the world in search of adventure, helping humans and mice alike. The series has also aired on This TV and has been streaming on Netflix.
In "The Case of the Disappearing Diamond, Emily & Alexander, the two cousins, are in England for Queen Victoria's Golden Jubilee, and have to recover a missing diamond from the queen's crown........
Now, I'm not sure if this was even inspired by Disney's "The Rescuers", but it wouldn't be a surprise if it was.