The Book of Adornment
48/47. Chapter:
Description of the Ring of the Prophet [SAW]
Sunan an-Nasai
أَخْبَرَنَا أَبُو بَكْرِ بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا أُمَيَّةُ بْنُ بِسْطَامٍ، قَالَ حَدَّثَنَا مُعْتَمِرٌ، قَالَ سَمِعْتُ حُمَيْدًا، عَنْ أَنَسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ خَاتَمُهُ مِنْ وَرِقٍ فَصُّهُ مِنْهُ .
It was narrated from Anas that: The Prophet's ring was made of silver and its stone (Fass) was made of silver too.
Reference : Sunan an-Nasa'i 5199In-book reference : Book 48, Hadith 160English translation : Vol. 6, Book 48, Hadith 5202