Sunan an-Nasa'i, Volume 6, Book 48, Hadith 5200 (DarusSalam) ⓘ

It was narrated that Anas bin Malik said: "The Messenger of Allah [SAW] had a ring of silver which he wore on his right hand. It had an Ethiopian stone (Fass), and he used to wear the stone (Fass) next to his palm."

أَخْبَرَنَا أَبُو بَكْرِ بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا عَبَّادُ بْنُ مُوسَى، قَالَ حَدَّثَنَا طَلْحَةُ بْنُ يَحْيَى، قَالَ أَخْبَرَنِي يُونُسُ بْنُ يَزِيدَ، عَنِ ابْنِ شِهَابٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم خَاتَمُ فِضَّةٍ يَتَخَتَّمُ بِهِ فِي يَمِينِهِ فَصُّهُ حَبَشِيٌّ يَجْعَلُ فَصَّهُ مِمَّا يَلِي كَفَّهُ ‏.‏