Elegant Black Tourmaline Obsidian Pendant for Men Aphrizite, so called jet stone, is the highest level Black Tourmaline , which is one of the most common varieties are rich in iron and titanium. Its powerful electromagnetic field can absorb and weaken the body and the environment, negative energy, effectively relieve stress, fatigue and aggregate, helps to regulate blood circulation, promote sleep, the human body health has a positive effect. Obsidian Pendant brings good luck