Hadith
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
Sahih · Abu Ghuddah
Sunan an-Nasa'i 5199 ·Book 48, Hadith 160·Also available on sunnah.com·