This is a 13mm Pietersite, item number ②. I also have items ①, ③, and ④ listed. The main effects of Pietersite are "calming inner turmoil and promoting mental stability," "enhancing intuition and insight, and providing guidance for the future," and "deepening self-awareness, freeing from fixed ideas, and supporting progress." It is also known as the "stone that opens the gates of heaven," and is particularly popular as a power stone to help you stay true to yourself in difficult situations and move towards your goals with decisiveness and courage. Natural stone: Pietersite, large bead #Du's Natural Stone Materials