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Machine Robo character
Machine Robo Diaman in box
First appearance

Machine Robo: Revenge of Cronos episode 34, "Vikung-Fu Disappears in Space"
Created by

Voiced by

Show Hayami
Japanese name

Release number

Species Rock People


Battle Base personnel, Jewel People
Alternate mode

Diamond rock

Diaman is a fictional character from the Machine Robo series introduced in 1986. He is one of the Jewel People from Machine Robo: Revenge of Cronos.

Machine Robo

Diaman is a heroic member of the Jewel People who turns into diamond. He is often associated with the two other Jewel People, Amberman and Rubyman. Like most Rock People he is probably immune to the effect of acid and magnetic fields which adversely affect most mechanoids. He stands 7 feet 5 inches tall. His weapon of choice is his Hard Blade.

Animated series

Machine Robo: Revenge of Cronos

Diaman first appeared in Machine Robo: Revenge of Cronos episode 34, "Vikung-Fu Disappears in Space", where Rom Stal recovers him from space with the help of Big Shuttle Robo.

In episode 36, "Cannon Fury - Save Amberman", Diaman and Rubyman helped Rom in approaching Amberman.[1]

Diaman in Machine Robo: Revenge of Cronos episode 38, "Raise Your Gun Helitranser"

In episode 38, "Raise Your Gun Helitranser", Rom Stol lead a team which included Diaman that opposed a Gandora group lead by Diondora that searched for an artifact near the Dragon Waterfall.[2]

In episode 43, "Mighty Fortress, Heavenly Sword - Jet Don't Die!" the Battle Base was launched in pursuit of the Varigale-X and then attacked the Gandora mothership. Manning the Battle Base was Bike Robo, Diaman, Kendo Robo, Jeep Robo, Judo Robo, Mixer Robo, Missile Tank Robo, Patrol Car Robo, Porsche Robo, Supercar Robo and Trailer Robo.[3]

Note: Diaman voice actor Show Hayami has also voiced numerous Transformers voices in Japan, as far back as Ironhide and Spike Witwicky in Fight! Super Robot Lifeform Transformers up until Vector Prime in Transformers: Galaxy Force.[4]

Machine Robo: The Running Battle Hackers

Amberman, Battlerock, Diaman, Maskrock and Rubyman appear together in Machine Robo: The Running Battle Hackers episode 1, "Burning Electronic Planet".[5]

Amberman, Battlerock, Diaman and Rubyman appeared in episode 4, "The Strongest Warrior - R Jetan".[6]

Blue Jet, Diaman, Karate Robo and Kenpo Robo appeared in episode 5, "Crystal Eavesdropping Strategy".[7]


  • Bandai Machine Robo: Revenge of Cronos MRR-7 Diaman (1986)
A new mold by Bandai. Turns from robot to diamond rock. Comes with his Hard Blade weapon.
This toy was recolored into Rock Lords Solitaire.



External links

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