Sea Diamond

Sea Diamond is a genuinely kind-hearted Diamond, a rare breed indeed. She, also contrary to the norm, has no Diamond sisters, she has always existed alone. She used to wander the galaxy, creating new life on dead planets and nurturing them. She loves her gems dearly. However, she learned of the existence of other Diamonds when her court found a lost gem in space. She learned that other Diamonds were feared, but was not fully convinced they could all be bad. 

Then, she met one.

After the disaster, she vowed revenge. She would not let these cruel Diamonds run free to torment and kill their gems. She would recruit any who would follow her into an army, and tear them down in the name of those they killed and abused. 

However, she's also found a lot of bitterness in the existing resistances. She doesn't blame them; they've all been hurt by their Diamonds, and they balk at the idea of being led by a Diamond once again. But she will support them best she can, anyways. They will make a difference.