Ash-Shama'il Al-Muhammadiyah, Book 12, Hadith 97 (English)

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

حَدَّثَنَا عَبْدُ اللهِ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ‏:‏ حَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى وَهُوَ ابْنُ الطَّبَّاعِ، قَالَ‏:‏ حَدَّثَنَا عَبَّادُ بْنُ الْعَوَّامِ، عَنْ سَعِيدِ بْنِ أَبِي عَرُوبَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ‏:‏ أَنَّهُ صلى الله عليه وسلم كَانَ يَتَخَتَّمُ فِي يَمِينِهِ‏.‏

also referenced under: Book 13, Hadith 103 (In-Book)