Now let’s come to 13 mukhi.

Depending on text, classified as Kamadeva swaroop or as Indra swaroop.
As with all higher number faced Rudrakshas, one should verify whether real or not prior to putting on body.

What exactly is a 13 Mukhi Rudraksha:
Suitable for householders.
Said to fulfil desires.
As Kamadeva, it is said to help people in finding someone from the opposite sex who is in harmony with their spandana.

Some people wonder how can Kamadeva still exist?
Well, Kamadeva is born from the 1/3rd part of Devi’s power: Iccha Shakti.
As such he has Amaratva.
That Kamadeva is essential for some Rasa in normal people ‘s life.
Not everyone is a sanyasi.