Large Grape Agate Cluster. This Purple Chalcedony is a calming and sedative crown chakra stone. This stone of grace cleanses perceptions, identifies what is important, and allows you to sit peacefully. Its tranquil nature helps to dismantle defenses and open up your heart. Use grape agate for emotional support and to overcome inner doubts of fear. Drop the ego and live to serve. Found in Indonesia. Approximately 9 x 7 x 4 inches.