In ancient China Concubines and Empresses used Jade Yoni eggs for centuries for the health of their sexual functioning. Nephrite Jade Egg is the most dense, non-porous and unbreakable stone other than perhaps a diamond! which great for beginners. On a subtle energy level, Jade is a very gentle gem, a calming, balancing  stone.  It is said to have the ability to help heal the female reproductive system.