Crystals have the effect of removing distractions and enhancing concentration. They are also recommended for those who want to see things calmly without being swayed by their surroundings, and for those who want the strength to face difficulties. In addition, it is good for those who have dreams and goals they want to achieve to wear them as an amulet. They are said to be all-purpose stones. 12mm 16-17cm *This product is also listed on other sites. Also, because we also sell face-to-face, we may delete it suddenly. Thank you for your understanding.