You can read more about the stone here >> Serpentine

Serpentine promotes tolerance, wisdom and self-control. It balances mental and emotional levels. It calms nervousness and stress. It provides peaceful sleep. It is the stone of new beginnings as it eliminates the fear of change. It protects against various forms of emissions and removes the negative energy to which we are exposed daily. Feng shui masters recommend that Serpentine be placed in every corner of the house, apartment, or office.