Onyx is excellent for centering and aligning of yourself with the Higher Powers. It can be used to banish grief, enhance self-control, stimulate wise decision making, and encourage happiness and good fortune. It helps one to absorb energies which are needed from the Universe.
Onyx can be used to cleanse the intuitive receivers so that one may feel connection to the whole and be aware of the opportunities available for intuitive guidance from the Inner Self.
Onyx can also help one to see the duality of oneself and provides glimpses of that which lies "beyond". It assists one in following the path alone, promoting recognition of personal strengths. It assists one in becoming the master of their future.
This listing is for ONE crystal.
Information taken from Melody - Love is in the Earth Crystal Encyclopedia - pg 527