Here is a single strand sale of Brazilian black tourmaline, which suggests a recent resurgence in popularity. Each strand contains approximately 70 mirror ball beads, 6mm in size. 6 x 70 equals a length of approximately 40cm. One strand is enough to make two bracelets for an average-sized adult male, with about 10 beads left over. For a necklace, it's enough for a perfect fit around the neck of an average-sized woman. Two strands provide enough material to create a necklace and two bracelets. Bulk sales are also available. As of 7/5/2024, the total stock is approximately 130 strands. 【Black Tourmaline】 Black tourmaline is said to generate the strongest negative ions among tourmalines, which have the property of carrying electricity. It became famous during the health boom. It is black in color due to its high iron content and was not treated as jewelry (also known as schorl tourmaline). Although the health effects of negative ions have not been clearly elucidated, it has been cherished since ancient times as a stone with the power to ward off evil and enhance immunity and vitality. It is said to protect the wearer from negative energy, alleviate anxiety and sadness, enhance the function of the endocrine system, and increase the regenerative power of cells and tissues, thereby providing vitality.