For your consideration are these gorgeous Fire Agate tumbled stones from Mexico.
These tumbled stones are available in the following sizes:
Medium: approximately 1 inch (10 grams)
Large: approximately 1 to 1.25 inches (20 grams)
Mexican Fire Agate is a protective and calming stone with grounding energy. Stimulates Prana (life force) and vitality. Protects one's energy from negativity and returns it to the sender.
Chakra: Root