I absolutely love working with bigger pieces of Picture Jasper. Picture Jasper is very grounding and calming stone. It brings my energy down to our root chakra. 
Black Zebra Jasper. Jaspers are the nurturers, the healers and the spirit stones of courage and wisdom. They all carry a strong connection to the Earth's energy, making the jasper healing properties very beneficial for grounding, stability and strength.
Lava Rock is known for being a grounding stone, one that can balance the emotions and bring about calmness and strength. It’s believed to help keep tempers in check and also help its wearer to work through problems in a logical way. At the same time, there is a raw energy about Lava Rock, since it is born out of the fiery heat underneath the earth’s surface. This energy is said to represent rebirth or renewal. Lava Rock is known for helping to promote fertility.
Golden Black Obsidian  is a powerful cleanser of psychic smog created within your aura, and is a strong psychic protection stone. This stone has powerful metaphysical properties that will help to shield you against negativity. 
It is believed to provide powerful protection creating a bubble around the carrier, warding off psychic attacks and negative energy.