Hadith 48:161
Sahih (Darussalam)
It was narrated that Anas said:
"The ring of the Prophet [SAW] was made of silver and its stone (Fass) was made of silver too."
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا مُوسَى بْنُ دَاوُدَ، قَالَ حَدَّثَنَا زُهَيْرُ بْنُ مُعَاوِيَةَ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ، قَالَ كَانَ خَاتَمُ النَّبِيِّ صلى الله عليه وسلم مِنْ فِضَّةٍ فَصُّهُ مِنْهُ
Original Reference: Sunan an-Nasa'i 5200