Black coral is mixed with the sacred seed bead Rudraksha which is grown on the holy Rudraksha tree. This tree is found in India and many parts of Asia. The seeds are sacred and are thought to be the tears of the God Shiva he cried when creating the universe. They balance equilibrium and promote courage, compassion and integrity. They may grow darker as they mix with the oil on your body. They balance out the ph in the physical body and soothe the spiritual self. These beads will enjoy some sandalwood oil to nourish and protect them. No need to wear them whilst you are asleep.