Richie and the Diamond Mine is a Gems segment that aired on Episode 6 in the second season of the Richie Rich cartoon series, as part of The Richie Rich/Scooby-Doo Show. The episode first aired on ABC on October 31, 1981 (Halloween).
Richie and Gloria are in a diamond mine, wearing hard hats, exploring some of the diamonds in existence. Gloria discovered two bins filled with diamonds, and was wondering why this was the case. Richie then unveiled the truth - one bin had diamonds belonging to Regina Rich, and the other bin had diamonds belonging to the rest of the world.