Rudrakshas are born from TEAR DROPS OF BHAGWAN SHIVA. Some translations are that Rudrakshas are born from SWEAT OF BHAGWAN SHIVA.
RUDRA=SHIVA
AKSHA=EYE
Rudraksha wearing is mentioned in our ancient texts from time immemorial. It is very loving to our Mahadev. It can be worn by men, women, and animals. The scientific name of the rudraksha plant is Elaeocarpus Ganitrus. Rudraksha bead is known as Elaeocarpus Ganitrus Roxb. These species are mostly found in Indonesia and Nepal.

There are six important members of ELAEOCARPACEAE:
ELAEOCARPUS GANITRUS:
These are found in Nepal, Malaysia, and Indonesia. These are also found in North Bihar, Assam, Bengal, Arunachal Pradesh in little amount. These are mentioned as pure and powerful in ancient texts of India (Bharat)
Rudraksha flowers are white and seeds are blue in color.
Floribundas Blume
Oliongus Mast
Petiolatus Wall
Serratus Linn
Tubercultus :
It’s known as Rutthracham in Tamil and Dandeli in Kannada. This species has an egg-shaped seed which is famous for one face moon shape (cashew shape) rudraksha.

This seed is used in a very large amount for wearing due to its spiritual qualities and the instinct of one face round Nepal Rudraksha. But this rudraksha is not mentioned in our ancient texts.
Only Elaeocarpus Ganitrus Roxb should be worn.
The egg-shaped is not a rudraksha according to our ancient texts.

There is one face Sawar rudraksha from Nepal is available. It is very next to round one face rudraksha. It is one of the best alternatives to one face round.

These are some species such as E. Prunifolius, E. Glabrescens and E. Amoenus which give the fruit of one face rudraksha. Two-face Rudrakshas are found in less and three-four face Rudrakshas are found in the very lesser amounts on these trees. These do not fruit five face seeds.
These have moon shapes instead of round.
There is light, unclear, and without hole, rudrakshas found in Andaman and Nicobar and Hawaii island.
Polystachyus, E. Pendunculantus and E. Rugosus give two face rudrakshas.
Parvifolius, E. Nitidus and E. Stipularis give only five face rudrakshas.
Cuneatus, E. Floribundus and E. Cyanocarpa are mainly found in Malaysia which produces only three face rudraksha.
Puniculatus, E. Sikkimensis, E. Obvatus and E. Csubvillous produce unclear faces which are used to make fake Rudrakshas by creating artificial lines. These also produce some clear face rudrakshas.
There is also species which is known as BHADRAKSHA. Their plants are also known as Koenigii, Goodeniaceae, Scaevola Fruitescens, Lanceaefolius, and Sikkimensis. These have flat seeds, little thorny, and light in weight. These have mostly two face rudrakshas which do not have a natural whole.

Its description is found in some ancient texts. But they are of light quality. These are used for gifts. These are used for specific and limited purposes. The Bhadrakshas are also used for making fake Rudrakshas.
Our ancient texts such as Shiv Puran, Padam Puran, Srimad Devi Bhagwat Puran, Skand Puran, Skand Puran, Rudraksha Jabolupnishad, Linga Puran, Katyayan Tantra have mentioned Rudrakshas.
It is mentioned that Rudrakshas are found from Gaud Desha to Mathura, Kashi, Malyachal. Gaud Desha is a present area of Bengal to Bhuvaneshwar. Following Sloka from Skand Purana clearly mentions about it:
“वंगदेशं समारभ्य भुवनेशांतग: शिवे, गौड़ देश: समाख्यात: सर्वविद्या विशारद:।”
Present time Species of Rudrakshas are found in Borneo, New Guinea, Madagascar, South China, Fiji, Japan, Hawai, New Caledonia, Philippines, Malaysia, Newzealand, Thailand, Tibet, Myanmar, Bhutan, Srilanka, Nepal, India.
Farmers are using chemicals for quick growth, a large amount of Rudrakshas. Their logic is that they want to protect the rudraksha fruit from insects etc. This is a big problem because the use of pesticides etc. definitely influences the power of Rudrakshas.

Farmers also produce Hybrid Rudrakshas. So, we should be very careful about such types of Rudrakshas. There is a difference between hybrid and Papua New Guinea Rudrakshas. This type of Rudrakshas is very big and known as Papua Rudrakshas.

Only Elaeocarpus Ganitrus (plant) produces wearable Elaeocarpus Ganitrus Roxb (seed) for physical, mental, and spiritual benefits.
Purification/Energisation

There is a very rigorous and special process of Purification and Energisation. It is needed to unlock the maximum energy of a Rudraksha . It takes about a month to complete the process.
Purification & Energisation is a very important process without which no one should wear a Rudraksha. Rudraksha absorbs different types of energy before reaching you as it goes in many hands and many places.
So, nowadays this process becomes more important not only for unlocking the hidden potential of rudraksha but also for washing out unwanted energies.
Energy can not be unlocked without proper methods and constant practice. That’s why generally Rudrakshas do not operate in their full capacity. So, the next most important thing is Purification & Energisation of a Rudraksha
।।रुद्राक्षधारणच्श्रेष्ठम न किञ्चदापि विद्यते ।।
{ There is nothing best to wear Rudrakshas. Means Rudrakshas are the best solution for every kind of problem}
This sloka is mentioned in Shri Devi Bhagavatam (श्रीदेवीभागवतं महापुराणं).

Watch Talk on mystic bead Rudraksha by Mr. JYOTiY in Hindi for more details.
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Read about One Face Rudraksha.