Rough Black Tourmaline Post Earrings. These will be your new favorite earrings. Black Tourmaline chunks are the feature on these surgical stainless steel post earrings, and have silver tone butterfly style earring backs. The tourmaline pieces measure about 1/4"-1/2". We do have smaller pieces of tourmaline in our shop as well. You will receive a pair of earrings equivalent to the ones shown. These are natural stones, so no two will be exactly alike. Item# NG3494 It is believed that Black Tourmaline is a powerful stone for protection against negative energy of all kinds, as well as being a strong spiritual grounding stone. It is associated with joy, strength, peace & compassion. It surrounds one with a strong protective shield and helps facilitate inner & outer balance. It also deflects negative energies & can be worn when going into negative environments.