The Prophet's ring was made of silver and its stone (Fass) was made of silver too.
Sunan an-Nasa'i Book 48, Hadith 160
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Sunan an-Nasa'i Book 48, Hadith 159 Next Hadith → "The ring of the Prophet was made of silver and its stone (Fass) was made of silver too."

Sunan an-Nasa'i Book 48, Hadith 161