On sale date from publication date reported to the U.S. Copyright Office recorded in the Catalog of Copyright Entries, Third Series, Volume 30, Part 2, Number 2, Periodicals, July-December 1976. Copyright number B140069.
Mrs. Rich and Irona are enthralled by the new mood ring craze. A foreign little man offers to sell Richie a priceless diamond that behaves like a mood diamond, changing colors based on the holder's mood.
Indexer Notes
story continues with "The Mood for a Million", same issue
The Riches offer to buy the Mood Diamond, on the condition that the little foreign man can show proof of ownership first. Suddenly a gang of sword-wielding Oomigoomian men gang up on the little man (revealed to be the Thief of Oomigoomi) and demand the sacred eye of the idol. The Thief and the gang work out a deal to take the Riches money AND steal back the diamond!
Indexer Notes
story continues with "The Idol Rich", same issue; continued from "The Mood Diamond, Part 1", same issue.
The Thief slinks around the mansion, trying to identify and locate the diamond after Mrs. Rich has it set into a piece of jewelry. When Mrs. Rich is dressed for the ball, she looks exactly like the Idol of Oomigoomi come to life!
Indexer Notes
continued from "The Mood for a Million", same issue
Dr. Brainwave shows Mr. Rich his new machine, which can give animal abilities and characteristics to humans. Cadbury starts acting strangely and scares the Riches visitor, Mrs. Oyster-Shell.
After playing mean pranks on Richie and his friends, Reggie is nervous about a surprise package that's delivered to him, thinking that payback time is coming!