Smoky Quartz clears the aura of negative energy, and removes emotional and mental blocks. It is said to be one of the best stones for grounding.
Size will vary based on weight selected.
While crystals are not a substitute for any medical treatment and are not a cure for any health condition, I have found that there is power in crystal meditation and setting intention with your crystals. Envision goal realization with your crystals and allow your crystals to attract positive energy.