Bloodstone:

Bloodstone is historically known as one of the oldest stones on the planet and has been used by warriors for centuries for protection.

• It has been used to cleanse and purify the blood
  
• It is used to block your own psychic impressions or psychic feelings if they are unwanted
  
• It shuts down the psychic centers allowing you not to be distracted by external influences
  
• Bloodstone is a very good grounding stone and was used by Druids in magical ceremonies to protect against evil spirits