Wearing Navratna or gem stones are believed to change the luck of people. Those people who believe in horoscope and astrology wear Navratnas based on their birth star or Nakshatram. People wear these rare stones to fulfill desires, to stay away from the tactics of enemies and also to lead a peaceful life. Manik or Manickam (Manikyam) or Ruby is associated with Krittika, Uttara, Uttarashadha Nakshatras. These birth stars are also known as Kartika, Uttram and Uttradam.
Manickam or Ruby is associated with Navgraha Surya.
Wearing Ruby or Manik stone by people born in Nakshatra Krittika, Uttara and Uttarashadha is said to help in alleviating poverty, bringing peace and it also helps in keeping diseases away.