One Mukhi (Kaaju Dana Small) Rudraksha

The one mukhi Rudraksha, mother of all rudrakshas, is the best and most powerful of rudrakshas. It has one facet only. It can be round or crescent shaped. The former is rare and the latter is popularly available in India and Sri Lanka. The ruling planet of this bead is the Sun. 

It enhances the confidence and focus of the wearer. There is an increase in leadership qualities and personal power. One starts working towards material gains. This bead nullifies the malefic effects of the Sun. These are normally related to ailments of the right eye, head ache, ear ailments, bowel problems, bone weakness, heart problems etc. All obstacles in the path of worldly pleasures are removed, and the bead helps one attain perfection in after life. 

Goddess Lakshmi bestows her blessings on the wearer of the one mukhi rudraksha. This bead is the symbol of Lord Rudra, Lord Shiva and Lord Shankara. It can be obtained by their grace only. 

This bead bestows prosperity on the devotees. It leads to enlightenment, truth and eternity. One attains the highest state of spirituality with ease. It bestows health, wealth and mental peace. It gives material pleasures, but also nurtures a feeling of detachment simultaneously. It helps in decision making, enhances confidence, and gives leadership qualities. It removes obstacles from the path of worldly pleasures and also simultaneously detaches one from worldly affairs. It enlightens the super consciousness and bestows a peaceful life. This rudraksha can be worn by doctors. 

A special puja can be offered for the one mukhi rudraksha on the Ashtam tithi of the lunar month of Chaitra, in the bright half. This Rudraksha is worshipped by offering 108 red coloured flowers. An oil lamp should be lit and essence should be burnt. The Rudraksha should be smeared with the paste of Sandalwood and camphor. Each of 108 flower should be offered while chanting the mantra. This worship should be repeated on Deepawali day, once again. This rudraksha should be capped in Gold or Silver and worn round the neck or be placed in the puja room. The auspicious day for wearing this Rudraksha is Monday.

Om Namah Shivaya
Om Rudra Ek Vaktrasya – Om Hreem Namah

Salutations to that supreme lord Om who has one face. Salutations to that lord who is giver of all the auspicious fruits.

Om Hreem Shreem Kleem 
Ekamukhaya Bhagwate Anurupaya 
Sarvayugeshwaraya Trailokyanathaya 
Sarvakama Phalam Pradan Namah.

Salutations to that supreme being (Om) who bestows all auspiciousness (Hreem), renown (Shreem) and wealth (Kleem). I salute the god having one face, who is the lord of all the times and of all the beings. Salutations to the lord of all three worlds who is the giver of all the pleasures and enjoyments.

As per Classics: 

MahaPuranam Srimad Devi Bhagavatam by Maharshi Veda Vyasa 
(Book IX Chapter VII)

One-faced Rudraksha reveals Paratattva (the highest Tattva); when worn, the knowledge of the highest Tattva arises; the Brahma is seen then.

Shiva Purana 
(Chapter XXV) 

64. A Rudraksha of a single face is Shiva Himself. It bestows worldly pleasures and salvation. The sin of Brahmin slaughter is washed off at its mere sight. 

65. Where it is adored, Fortune cannot be far off. Harm and harassments perish. All desires are fulfilled.

Padma Purana 
(Shrishti Kand Chapter 57) 

Ek mukhi (one facet) is Lord Shiva incarnate, it absolves the sin of committing murder of a Brahmin (Brahman-Hatya). It must be therefore worn over body and this (action) absolves the person of all the sins committed. Thereafter, the wearer of one mukhi rudraksha goes to Shiva loka (the abode of Lord Shiva) and lives happily with Lord Shiva himself. This requires kind patronage of Lord Shiva to get such a resultant situation (after several events). O Shadanan (six headed one)! A dying person wearing one mukhi rudraksha gets nirvana (gets out of cycle of birth & death).

Rudraksha Jabalopanishad 









Lord Kalagnirudra said: The bead with one face is of the form of the Supreme Truth. A disciplined one (controlling his senses) mingles himself with the one Eternal Truth, after wearing these Rudrakshas.

Beej Mantra : Om Hreem Namah!