Black Quartz is said to:
Be a powerful protective crystal that can ward off any negativity which can affect your body, heart, mind, and soul. It will cleanse your aura so that you will attract only positive vibrations. This crystal will allow you to remove stagnant energies and to activate your chakras.
White Quartz:
It balances and revitalises the physical, mental, emotional and spiritual planes. Cleanses and enhances the organs and subtle bodies and acts as a deep soul ...
This is a combined bracelet with black & white that is said to protect against jealousy and envy and helps to promote positive energy into your life.