The benefit of Sulemani Akik is that it creates joy in the heart, is good for eyesight and it helps illuminate sadness and anger. Black Chalcedony or Sulemani Kala Akik or Kala Sulemani Aqeeq is a Semi Precious Gemstone is be used by many astrologers to nullify the evil effects of Rahu and Ketu as per Indian Astrology.