Where on Earth Is Carmen Sandiego? (1994)

S3E4 Birds of a Feather

The Star of Africa, the largest diamond in the world, has mysteriously vanished, leaving the police stumped. Zack and Ivy take on the challenge to solve the case. Their investigation leads them to uncover that one of Carmen's henchmen attempted to betray her by keeping the diamond for himself. Using their clever tactics, the duo manages to retrieve the stolen jewel.