Black Lava Stone & Orange Fire Dragon Veins Agate in Crown Charms. Yellow amber has been used traditionally by natural healers to improve memory, increase mental flexibility and create balanced decision-making. Amber has also been used, historically, as a talisman for courage and self-confidence, and was thought to bring good luck to warriors in battle. Black Lava Stone best known as a “grounding stone”, believed to strengthen the wearer's connection with Mother Earth and give strength and courage in times of change and stress. It's also supposed to provide people with guidance and courage in situations when they need them. 8mm beads, adjustable. Fits most wrists.