Blue Onyx is a Seeker Transformer Crystal. Seeker Transformers are talismans used when the desire is to find a way to transform a part of one's life to a more desirable state. Seekers are used when we need some help to find a new path, a new approach, or in any quest to gain that which we desire but do not yet possess.
When they possess the Earth Power of the Transformer, like Onyx they form crystals that are excellent for seeking new capabilities that will transform some part of our life.
The blue signifies trust and respect. Clearly happiness is to be found in assuring your reputation for trustworthiness stays spotless. It would appear that some of your prosperity is tied to this, since the blue stone extends into the southeast area of prosperity and abundance.
Blue Onyx has Water energy. Water energy is symbolized by blue and black. Use these colors of crystals to enhance any space that you use for repose, calm reflection, or prayer. Use black crystals to bring the flowing energy of the water element to areas of your home and life that are focused on realizing your potential.
Water energy is traditionally associated with the entry or the North area of a home or room. It is associated with the Career and Life Path area. Its flowing energy will assure a balance of energy as your life unfolds and flows. To keep your life moving forward towards your goals use the water elements energy.
This is a guardian crystal for use on dark nights, and in dark places.
Blue Onyx is used in meditations to strengthen your inner self and controlling a temper.
Other practictioners have said blue onyx assists with emotional balance, relieve stress and grief and to increase self-control.