'Ali bin Abi Taalib Radiyallahu 'Anhu says:
"Rasulullah Sallallahu Alayhi Wasallam wore his ring in the right hand"
Hazrat Hammaad bin Salamah says that he saw Hazrat Abdur Rahman bin Abi Rafe' wearing a ring on his right hand. He asked him the reason and he replied, "I had seen Hazrat Abdullah bin Ja'far radiyallahu anhu wearing a ring on his right hand, and he said that he had seen the Prophet of Allah sallallahu alaihe wasallam wear a ring on the right hand."
It is related from Hazrat Abdullah bin Ja'far radiyallahu anhu from another source (another chain of narrators) that the Prophet of Allah sallallahu alaihe wasallam wore a ring on the right hand
Hazrat Jabir bin Abdullah radiyallahu anhu says, "The Prophet of Allah sallallahu alaihe wasallam wore the ring on the right hand."
Salt bin Abdullah says that Hazrat Ibn Abbas radiyallahu anhu wore a ring on the right hand, and as far as I can remember he used to say that the Prophet of Allah sallallahu alaihe wasallam also wore it on the right hand
Hazrat Ibn Umar radiyallahu anhu reports, "The Prophet of Allah sallallahu alaihe wasallam had a ring made of silver. The top portion remained towards the inside. On it was engraved 'Muhammad the Rasoolullah'. The people were prohibited from making this inscription on their rings. This is the same ring which fell from the hands of Hazrat Mu'ayqib radiyallahu anhu into the well of Arees during the reign of Hazrat Uthman radiyallahu anhu.
Imam Muhammad Baaqir relates that Hazrat Hasan radiyallhu anhu and Hazrat Husain radiyallahu anhu, both wore their rings on their left hands
It is related from Hazrat Anas radiyallahu anhu that the Prophet of Allah sallallahu alaihe wasallam wore a ring on the right hand, and some people have also related from Hazrat Anas radiyallahu anhu that the Prophet of Allah sallallahu alaihe wasallam wore a ring on the left hand
Hazrat Ibn Umar radiyallahu anhu relates that the Prophet of Allah sallallahu alaihe wasallam had a ring made of gold which he wore on his right hand. The Sahabah radiyallahu anhum in imitating the Prophet of Allah sallallahu alaihe wasallam also had gold rings made for themselves. Thereafter, the Prophet of Allah sallallah alaihe wasallam threw away the gold ring and said, "I will never wear it again."