Black star stone is a calcium magnesium silicate type of mineral that shows a distinctive star-like pattern called asterism on the surface when light is incident on it. It is found in Thailand, Tanzania, and Sri Lanka. Black star diopside or “Black Star of India” has a four-pointed star, while black-star sapphire displays six- or twelve-pointed star. The star effect is created by needle-like inclusions in the stone. The stone is believed to provide emotional balance, trauma healing, and spiritual connection. Black Star of India is a highly sought after gemstone, known for its striking black color and the four-pointed star effect (asterism) displayed by the cabochons. It has dark, opaque black or blackish-green color. The gemstone is popular in jewelry industry. It is believed to help with emotional balance, trauma healing, and spiritual connection.