This red and black combination of strength and protection stones will help you ground your self in any practice.
Red Jasper: It is known as the Stone of Endurance, a gentle, but vital, stimulator of chi, or Life Force, bringing physical strength and energy, stamina, focus and determination. 
Onyx: It is used as a personal amulet of protection. It is said to help deflect others’ negative thoughts or criticism, and for effective defense against those who are manipulative or argumentative.