We are the Twisted Gems

The force fusion experiments that homeworld used to run were not all unsuccessful, there were three successful experiments. There is a half Onix, half Obsidian, who is the bottom of the group, or the weakest. The next is a Half Moonstone, Half Sun-stone force fusion, who of the trio is the second in command. The last is a creature homeworld tries to keep secret, but does not always succeed in doing so. His name Is Bismuth, and he was created from Gems, and a race classified as Metals. His own team does not know his full compound, and does not wish to know. He leads this group of mashed gems, and they try to protect the Earth for it is the only planet they know of to protect, and they do a good job.
(As always, I found cover art on the internet, Here's the link google gave me for the art)
http://douhong.blogspot.com/