Four mukhi Rudraksha is a symbolic to Load Brahma(god of Birth). It is good for meditation and yoga. Its increases confidence and devotional power.Good for Arthritis Patients & BP Disorders.
The Time & Rules of Wearing Rudraksha - Eclipse, full moon day, Sankranti (a planet’s passage from one zodiac sign to another), Amavasya (the last day of the dark half of a month), Vaisakhi, pilgrimage, the bank of Ganga, 
MahaShivratri, Diwali, after the visit of the deity of your spiritual guide, Kumbh ceremony(mela), any Ganga-fair, or any other big ceremony of any river, any ceremony of Lord,during Navratri, Ayan(the sun’s cross north to south 
of Equator or vice-versa) or any other good day.
The Identification of Original Rudraksha - There is no machine to identify the Rudraksha without destroying it. There are some thread like forms with its faces. Face is that which is alone part with its own pieces. If we break the
 Rudraksha its faces will break as the slice-piece of musk melon. In very rare cases, two Rudraksha may be same. Always remember that nature, and nature grows the piece as it wants not as we wants. The faces and the threads
 on Rudraksha is a wonderful work of nature.
The sinking one is original, the black,red or yellow is original or revolving between two copper-coins as be identified by an old person of his time so always purchase the Rudraksha from a faithful medium or shopkeeper.