Black crystals generally share similar functions, primarily focusing on warding off evil, preventing harm from malicious individuals, and removing negative energy. Black Rutilated Quartz, in particular, is renowned for these protective properties. It corresponds to the root chakra, aiding in strengthening the kidneys, absorbing illness, treating infertility, aiding sleep, and making actions more decisive.

The quality and energy of Black Rutilated Quartz are assessed based on the amount of rutile inclusions and the clarity of the crystal. The more rutile threads present, the stronger the crystal's energy. The clarity of the crystal can also change depending on your luck and health. Black Rutilated Quartz is potent because it not only forms a protective energy field around you but also repels negative energy and evil influences.

Note: According to energy principles, the left hand is for receiving energy and the right hand is for releasing energy. All black crystals are considered to be expelling crystals and must be worn on the right hand.