Chalcedony is a calming stone, and fosters stability, optimism, generosity, and benevolence. It helps to communicate with accuracy and authority during a speaking engagement, lecture, etc. It is associated with the throat chakra and can be used to prevent diseases of the throat and mouth, and to strengthen the voice. It calms nerves and promotes tranquility. Chalcedony was a sacred stone to many Native Americans and Tibetans. It is also a stone of protection and helps prevent accidents, nightmares, and negativity.