Thank you for your inquiry. For the gentleman in question, I would recommend a Black Tourmaline Pendant. It protects against EMFs, draws negativity away, and is calming too. To deal with Trauma, I would recommend a Green Fluorite pendant.
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.