Combining the energetic qualities of quartz and the powerful protective qualities of black tourmaline, this stone's primary function is to repel negative energy (this can refer both to external energies or inner emotions, such as anger, resentment, or jealousy).

Serving as a powerful shield-stone for protection and grounding, tourmalinated quartz strengthens and enhances energy sent at it. (For this reason, as with hematite, wearers must be cautious not to reinforce their own negativity.) Then, depending on the intent of the wearer, this stone can either send the amplified energy back to the sender -- or better yet, transmute any negativity into positive energy for the wearer.

With its yin/yang nature, tourmalinated quartz also helps balance male and female energies; the black tourmaline tends to neutralize one's negative energies while its quartz counterpart reaches out to positive energy fields.

On the physical side, tourmalinated quartz is said to sooth the central nervous system as well as help to alleviate depression and nervous exhaustion.