Lapis lazuli is a relatively rare gem. It has a Mohs hardness of 5 to 6 and a density of 2.7 to 2.9g/©P. Lapis lapis is the body color of Tibetan Buddhism traditional Chinese medicine Buddha, often worn to bless peace and health, keep disease and disaster free. Lapis lazuli is very helpful to the circulation of the human body. Wearing jewelry made of lapis lazuli for a long time can relieve stress, improve breathing, and is especially helpful for insomnia.