Thank you for your inquiry. For leukemia*, I would place Bloodstone in the center of your chest and over your heart. If it is at all possible I would use it in conjunction with Black Tourmaline, Jet, Obsidianand Smokey Quartzto enhance the energetic purification process. If you are looking to accelerate the cleansing process, I would add Moldavite to work with yourBloodstone.
I hope that these recommendations can be of assistance and that crystals grace your journey with love and light.
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*Disclaimer – Crystals are not a medical treatment and should not be used as a replacement for medical care. Please consult your healthcare specialist for your particular needs.