My #Gemsona Obsidian (Yes Its A Gem A Checked With Gemologist Friend), He Was The Black Knight For The Leader Of The Gems. He Was A Murderous Gem Who Hunted & Killed Others. He Was Sent To Earth To Destory The Crystal Gems, After Arriving He Had Accident & Damaged His Gem Causing Him To Lose His Memories Of Being A Murderous Killer So He Lived On Earth Helping Others. #XBBOC #StevenUniverse #SU #Gems