Ibn 'Umar said:
"The Prophet (Allah bless him and give him peace) chose a signet ring of silver, and put its stone in the part close to the
palm of his hand. On it he engraved: “Muhammad is the Messenger of Allah,” and he forbade anyone to engrave on it. It is the one that fell from Mu'aiqib into the well of Aris.”
'Ali ibn Abi Talib said (may Allah be well pleased with him):
“The Prophet (Allah bless him and give him peace) used to wear his signet ring on his right hand.”
Hammad ibn Salama said: "I saw Ibn Abi Rafi' wearing a signet ring on his right hand, so I asked him about that and he said: 'I saw 'Abdu llah ibn Ja'far wearing a signet ring on his right hand', and 'Abdullah ibn Ja'far…
Ash-Shama'il Al-Muhammadiyah · Book 12 · Hadith 99
حَدَّثَنَا مُحَمَّدُ بْنُ حُمَيْدٍ الرَّازِيُّ، قَالَ: حَدَّثَنَا جَرِيرٌ، عَنْ مُحَمَّدِ بْنِ إِسْحَاقَ، عَنِ الصَّلتِ بْنِ عَبْدِ اللهِ، قَالَ: كَانَ ابْنُ عَبَّاسٍ، يَتَخَتَّمُ فِي يَمِينِهِ، وَلا إِخَالُهُ إِلا قَالَ: كَانَ رَسُولُ اللهِ صلى الله عليه وسلم يَتَخَتَّمُ فِي يَمِينِهِ.
‘As-Salt ibn 'Abdi’llah said: “Ibn 'Abbas used to wear a signet ring on his right hand, without adornment, and he said: 'Allah’s Messenger (Allah bless him and give him peace) used to wear a signet ring on his right hand…