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Exploring the Various Types of Black Semi-Precious Gemstones Also known as Schorl, Black Tourmaline is a popular black semi-precious October birthstone known for its opaque deep black hue and talismanic properties against negativity. With a 7 to 7.5 ranking on the Mohs scale, it makes durable Black Tourmaline Jewelry that detoxifies your body, sucks bad vibes, and turns them into positive ones, soothing worries and bringing inner peace. https://www.sagaciajewelry.com/blogs/news/types-of-black-semi-precious-gemstones