Question Summary:
Is it permissible for a man to wear a ring made from iron or Tungsten?

Question Detail:

Salaamualaykum, is it permissible for a man to wear a ring made from Iron or Tungsten?

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is not permissible for men to wear rings made of any metal besides that of silver equivalent to 4.374 grams.[1]
And Allah Ta’āla Knows Best                                       
Ismail Desai,
Student Darul Iftaa
Durban, South Africa
Checked and Approved by,
Mufti Ebrahim Desai.