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Diamond Jack is a name that has been used by several unrelated characters. The original was Jack Lansing, a hero who possessed a magic diamond given to him by a magician. This diamond increased the powers of his mind and body. The second Diamond Jack was a villain who fought Captain Marvel, Jr.. He was a member of the Ace, King, Queen, and Jack of Crime. Diamond Jack was created by Gus Ricca, first appearing in Slam-Bang Comics #1. (1940)