Salagrama Forms (Lakshana):
Sri Ramar: Bow shaped Inscription / Rekha. Big , Long, Green Colored, Dotted, Chakra inscription in the Centre, many holes. (Sreethatvam)
Seetha Ramar: Egg Shaped. Kudala Rekha (Studded Inscription). Same sized Chakra or KalpaVirusha rekha near the hole. Leftside near the head portion chakra Rekha. This Salagrama provide knowledge and Mukti.
Gopala Murthi: Colored. Dotted. Hole in the Backside. Makara Kundalam.(Fish Shapped ear ring). Bhana Rekha in the left side Forehead. Beautiful to look. Worshipping this Form of Salagrama will destroy the enemies. Give child birth. Also gives all prosperity.
Krishnar: Sphere shaped. Black colored. Small Hole.
Hiranya Garbha: White Shaped. Smooth. Big in Size. Long too. Chakra Rekha in hole (Sreethatvam).
Some people also claims that Small egg shaped without any Forms or Lakshanas which is in darkblue colored and smooth is also as Hiranya Garbha