1.5 cm included. It strengthens contact with nature, removes nervousness, strengthens the ability to concentrate. A symbol of symbiosis, it helps to achieve harmony, to leave and wish away everything that burdens, it is a support for those who have a hard time coping with the material world. By stimulating the imagination, it allows foretelling the future. Relieves pain, helps with infectious diseases and cancer. It strengthens blood circulation. It warms when feeling cold, protects against negative emotions.