The Navratna, or Gemstone, that is assigned to Birth Stars or Janma Nakshatras Mrigasira, Chitra and Dhanishta is Red Coral. It is known as Pavizham or Praval or Moonga in regional languages. Nakshatra Mrigasira is also known as Makiryam; Chitra as Chithirai and Dhanishta as Avittam. It is believed that wearing red coral helps a person in building self confidence and courage. It is also suggested by astrologers for keeping away diseases. The Navratna also ushers in prosperity.
Pavizham or Praval is associated with Navgraha Mars or Mangal.
As the Gemstone Red coral is associated with Mangal, it is considered a hot stone and is worn on silver and copper jewelry.
People born in Mrigasira, Chitra and Dhanishta Nakshatras wear red coral to avoid health related troubles and also to overcome enemies.