I made this cho ku rei In response to my own need for an effective way to visualise the cho ku rei sign for reiki practice. I have found this chi ku rei pendulum necklace extremely effective. Each pendant comes with a bronze chain in your choice of length.
Hematite for grounding 
Selenite for purification
Aventurine for heart wholeness and abundance
Lapis Lazuli for intuition and inner journeying
Rose quartz for love and compassion
Clear Quartz for clarity, channeling, manifestation
Black onyx for strength and protection