Mercury - Quicksilver Black Diamond 3-Blade Aluminum Propeller 12.75" Diameter x 21" Pitch Right-Hand Rotation 3-Blade Aluminum Phantom Black Finish QA2040X. Overview. There's something about slipping out onto calm water with the right prop under you - that steady, confident hum that tells you your boat's ready to move when you are. The Quicksilver Black Diamond has that feeling. It's the kind of prop that doesn't try too hard; it just works - every time. Smooth acceleration, solid grip, and the