Sardonyx is a stone that combines the energies of onyx and carnelian.  It's associated with courage and bravery and wards off negative energies.  It's known to help in bringing stability to your relationships, promoting lasting happiness.  It's believed to enhance mental clarity and improving your communication skills.  It helps to ground you, particularly after doing spiritual work.  It's also seen as a stone of virtue, encouraging honesty, integrity and ethical behaviour
 
Chakra: Sacral