6.5 cm. Agate, a stone of protection and strength. The foundation stone, affects the first, root chakra, brings vitality, courage and endurance. It helps with arteriosclerosis and allergies. It protects against harmful radiation and therefore belongs to computers. And don't forget to wash it under running water from time to time, otherwise it will turn gray. As a piece of jewelry, it helps to cleanse the body and therefore alleviates skin diseases. Then apathy also disappears or the dawning psyche eases. All of this will help us stay fit even in old age.