مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 4387
Clothing
Signet-rings - Section 1
وَعَنْهُ أَنَّ نَبِيَّ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ خَاتَمُهُ مِنْ فِضَّةٍ وَكَانَ فَصُّهُ مِنْهُ. رَوَاهُ البُخَارِيّ
He said the Prophet’s signet-ring was of silver as was also its stone. Bukhari transmitted it.
Mishkat al-Masabih, 4387صَحِيح (الألباني)