According to Shiva Purana, Rudraksha is said to have originated from the eyes of Lord Shiva in the form of tears that landed on earth near Kailash Mountain and formed the Rudraksha tree. This is why the Rudraksha tree grows mostly in the Himalayan regions of Nepal and India.
Rudraksha trees also grow in Myanmar, Indonesia (Sumatra and Java), Srilanka, the Philippines, Madagascar, etc.
However, different types of Rudraksha beads grow on the tree. They are based on the vertical lines seen running down on the surface. These lines are known as Mukhi, or in other words, “the clefts or furrows on the surface.” (For instance, if there are two vertical lines on the surface, then it is known as 2 Mukhi Rudraksha.)