Is a quartz to be use to help psychic ability and for grounding.
This is a very good stone to help balance your emotions,
if you feel depress just hold an obsidian in your hand.
Because of the Onyx colour of black and white, this is the perfect stone to help bring balance in your life.
Onyx is also very good to help you get rid og bad habit: Jalousie, smoking, envy,
Onyx will help you take charge of your life.
Because of the green colour of the Jade it is associated with the heart chakra
Jade is the best stone to help bring happiness, love, wisdom and good luck. An all around perfect stone.
If you only can have one stone get a Jade.