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nasai-kubra:9451 – Abū Bakr b. ʿAlī > Umayyah b. Bisṭām > Muʿtamir > Ḥumayd > Anas

The Prophet's ring was made of silver and its stone (Fass) was made of silver too. (Using translation from Nasāʾī 5199)  

الكبرى للنسائي:٩٤٥١ – أَخْبَرَنِي أَبُو بَكْرِ بْنُ عَلِيٍّ قَالَ حَدَّثَنَا أُمَيَّةُ بْنُ بِسْطَامٍ قَالَ حَدَّثَنَا مُعْتَمِرٌ قَالَ سَمِعْتُ حُمَيْدًا عَنْ أَنَسٍ

«أَنَّ النَّبِيَّ ﷺ كَانَ خَاتَمُهُ مِنْ وَرِقٍ وَفَصُّهُ مِنْهُ»  

See similar narrations below:

Collected by Nasāʾī, Abū Dāwūd
nasai:5199 – Abū Bakr b. ʿAlī > Umayyah b. Bisṭām > Muʿtamir > Ḥumayd > Anas

The Prophet's ring was made of silver and its stone (Fass) was made of silver too.  

النسائي:٥١٩٩ – أَخْبَرَنَا أَبُو بَكْرِ بْنُ عَلِيٍّ قَالَ حَدَّثَنَا أُمَيَّةُ بْنُ بِسْطَامٍ قَالَ حَدَّثَنَا مُعْتَمِرٌ قَالَ سَمِعْتُ حُمَيْدًا عَنْ أَنَسٍ

أَنَّ النَّبِيَّ ﷺ كَانَ خَاتَمُهُ مِنْ وَرِقٍ فَصُّهُ مِنْهُ  

abudawud:4216 – Qutaybah b. Saʿīd And ʾAḥmad b. Ṣāliḥ > Ibn Wahb > Yūnus b. Yazīd > Ibn Shihāb > Anas

The signet-ring of the Prophet ﷺ was of silver with an Abyssinian stone.  

أبو داود:٤٢١٦ – حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ وَأَحْمَدُ بْنُ صَالِحٍ قَالاَ حَدَّثَنَا ابْنُ وَهْبٍ أَخْبَرَنِي يُونُسُ بْنُ يَزِيدَ عَنِ ابْنِ شِهَابٍ قَالَ حَدَّثَنِي أَنَسٌ قَالَ

كَانَ خَاتَمُ النَّبِيِّ ﷺ مِنْ وَرِقٍ فَصُّهُ حَبَشِيٌّ