Black onyx is thought enhance your inner strength, and when you feel strong on the inside you feel strong on the outside. As far as we're concerned that makes it the perfect stone to use in pieces intended to remind you how powerful you are on the court. 
We aren't talking about turning you into a banger (unless you wanna!), but just adding a little power to your play. Attacking at the line, smashing overheads, well timed drives...they are some of the best parts of the game. Hopefully this piece can motivate you to make power a bigger part of your play.