Each stone varies. Bloodstone is typically found in India, China, Brazil, Australia and the USA. In the Middle Ages, the red spots on the stone were said to be droplets of Christ's Blood and that it caused the stones to harness magical powers. 
This stone is good for all types of blood ailments because it works at the source of the blood, within the bone marrow. It strenghtens and fortifies the blood to overcome illness. 
It can also help one fulfill one's commitments and face their obstacels. When someone is undergoing a change in their life due to spiritual awakening, bloodstone will help one overcome lonlieness and maintain faith.
Bloodstone is good for strength, courage, purification and vitality. The main Chakras effected by this stone is the Root (1st).