ENOfficial
It was narrated that Anas bin Malik said: "The Messenger of Allah (ﷺ) 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."
Source: sunnah.com
Other translations
Arabic
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 .
sunnah.com