Quite possibly an enemy of Kuroi Mato, Black Gold Saw has a similar outfit to Black Rock Shooter, except for the design of her jacket and her bikini top. She has a pair of black curved horns that change to red as it reaches the tip. Her weapon of choice is a large, black sword with a long handle and a curved hilt shaped like a crescent.
Beautiful Gold Saw! I actually thought she was an evil version of Black Rock Shooter, but I guess I was wrong. Thanks to Jessica for sending this in!