Generally the virtues and importance of Rudraksha is estimated by its facets. According to mythology one faced Rudraksha is the symbol of Godhood, Supreme Truth, Attainmentt of Eternity. Two face Rudraksha symbolizes Grace of Ardhanarishvara (Bi sexual God) Lord Shiva & Parvati Mata. It is worn for happiness and peace in the house and for the success in marital life. When the three faced Rudraksha (Grace of Agni) is worn, the wisdom of the wearer is increased. Similarly Four faced Rudraksha (Grace of Brahma) should be worn to get rid of mental diseases, worries, tension etc. Five faced Rudraksha (Destruction of homicide sin) is useful in cardiac diseases and for heart trouble. Six faced Rudraksha (Attainment of Chitta-Suddhi and Jnana) is worn to destroy sins. Seven faced Rudraksha (Saptamala) is beneficial in getting good health and wealth. Eight faced Rudraksha (Grace of Ashta Vasus or Ganga and becoming truthful) destroys obstacles and nine faced Rudraksha (Grace of Nava Saktis or Nine powers) gives earthly pleasure and salvation. Ten faced Rudraksha (Attainment of Peace) is useful to pacify nine planets. Eleven faced Rudraksha (Increases of all kinds of wealth) gives worldly pleasure. So he who wants worldly pleasure should wear it. Twelve faced Rudraksha (Attainment of Moksha) is the most important to the persons in high offices Intellectuals. Scientists, doctors, vaidyas who are engaged in chemical and medical researches should wear thirteen faced Rudraksha (Attainment of fulfilling desires and grace of Cupid). Fourteen faced Rudraksha cures all kinds of diseases. Being cured, the wearer enjoys the life like the god Indra.
One Faced Rudraksha:
One faced Rudraksha is itself Lord Shankar and it is the main among all Rudrakshas of all faces. It is ruled by the Sun. This Rudraksha enlightensthe super consciousness - "God". God is only one - He is the Truth and consciousness. "EKa meva Dviteeya sadroop". One faced Rudraksha is the symbol of the supreme God it is accepted by all.
It brings power of Dharana to the wearer. Dharana means the power to concentrate the mind on an object. The wearer of one faced Rudraksha gets his mental structure changed and he beings to feel renunciation from the worldly affairs and naturally inclines towards GOD. His mind begins to concentrate on - Supreme Element. "Partattva Dharana cha jayate Tatprakashnam". Thus the seekers of Aatma Tattva must wear one faced Rudraksha.
According to the mythological books peace and pleasure abide in the house where one faced Rudraksha is worshipped. There is no fear of untimely death. Its wearer himself is fortunate by himself. One who gets it and worships it obtains not only all the worldly pleasures during his life - span but also remains unaffected by them. It is an ideal thing for the doctors. It helps them to diagnose the disease and gives them success in surgery too.
This is the best in all faced Rudrakshas. One faced Rudraksha is found in two shapes round and the half moon shaped. Round Rudraksha is found in Nepal while the half moon shaped is found in Rameshwaram. From the point of view of importance there is no difference between them. Therefore, it must be real and pure in whatever shape it may be. The cost of round one faced Rudraksha is many times fold as compared to the the half moon shaped Rudraksha but it is a very rare item and often faked . So more and more people are turning to half moon shaped variety for its genuinely .
Rituals for wearing :- One faced Rudraksha should be capped with gold or silver and should be worn round the neck or be placed at the worshipping place, chanting "Om Namah Shivaya, Om Hreem Namah". The man should wear it on Monday. Getting up in the morning the devotee should salute the one faced Rudraksha first, pronouncing special Mantra. Such a devotee remains unaffected by misfortune and enjoys many pleasures.
Note :- There are many notions about One faced Rudraksha such as it is hardly available or there grow two or three pieces of Rudraksha. One of them disappears in the sky, the second one is given to the king of Nepal and the third one faced Rudraksha is mixed up with the prasaad of the Pashupati temple in Nepal. These are only hearsays. It does not happen so. One faced Rudraksha is found less than the other Rudrakshas.