It was narrated that Anas said:

"The ring of the Prophet ﷺ was of silver, and its stone (Fass) was made of silver too."

أَخْبَرَنَا الْقَاسِمُ بْنُ زَكَرِيَّا، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنِ الْحَسَنِ، - وَهُوَ ابْنُ صَالِحٍ - عَنْ عَاصِمٍ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ، قَالَ كَانَ خَاتَمُ النَّبِيِّ ﷺ مِنْ فِضَّةٍ وَفَصُّهُ مِنْهُ .