Cut Base Black Tourmaline
One of the most popular choices for protection, tourmaline holds a faint, but steady, electric charge. Black tourmaline is believed to help shield against negativity, by absorbing negative energy + transforming it into positive energy. It's also thought to help protect against electro-magnetic radiation given off by electronic devices such as phones, laptops or TV. Black tourmaline is also a great crystal to use for grounding + meditation.