Onyx means strength.  This crystal provides support in confusing circumstances and at times when you can be under a huge amount of stress and pressure.  The stone promotes vigor, steadfastness and stamina helping you to be at your best and help take you forward in your future.
 
Tumbled stones are convenient magic – potent enough to hold the properties of your stone, yet small enough to keep it close without feeling weighed down. Keep one of these pieces in your bra or pocket or hold during meditation to remind you that you are loved, cherished, and perfect as you are. However you choose to work with yours, may it serve you well.