This is not exactly a stone. This gemstone represents planet Mars. For any effective remedy of the Mars related problems this specific stone is used. This is usually worn on the ring finger in the right hand. The choice of hands is based on your debilation or exhalation of the respective planets. This stone is effective when worn above 6 carats. The puja remedy that you perform in temple is highly effective if worn with gemstone with proper sanctification and consecration. ((create ring n planets in a palm drawing))