Rhodolite

Rhodolite is a fusion gem fused by and  in her debut episode Coach Garnet as she is negative towards Gold as she tries to kill him in a fight as she is the main antagonist of the episode.

she was hit by both of her own nunchucks square on hewr head separating her back into Sapphire and Amber as well as knocking her out!

personality
she was friends with Gold until he left her behind then her only target was Gold in her rampage across the temple as her soft spot for Steve hasn't changed one bit as she never aimed her nunchucks at him a single time meaning that she still wants to impress him with her strength and power!