Every Weapon In Wonder Woman's Arsenal
2. Her Star Sapphire Ring
in 2009, DC Comics held a crossover event called Blackest Night, in which dozens of heroes and villains were possessed by the Black Lantern Corps (think Green Lantern, but powered by death instead of willpower and courage.)
Wonder Woman was one of these heroes. Given her prowess as a warrior, she did a fair amount of damage as a Black Lantern, which she later regretted immensely. However it was also this sense of regret and the vast compassion Diana possesses which helped resolve the crisis.
She was sought out by a Star Sapphire ring (again, think Green Lantern, but purple and powered by love,) which destroyed her Black Lantern ring and turned her into a member of the Violet Lantern Corps. She was now firmly on the side of good again.
The ring also added to her already formidable power set, giving Diana the ability to create energy blasts, force fields, and energy constructs, as well as allow her to phase through objects and travel in space.
The effects didn't last, but Diana has a standing place in the Violet Lantern Corps if she is needed.