Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai-kubra:9460 – ʿAmr b. ʿAlī > Abū ʿAttāb Sahl b. Ḥammād al-Baṣrī > Abū Dāwud > Abū ʿAttāb Sahl b. Ḥammād > Abū Makīn Baṣrī > Iyās b. al-Ḥārith b. al-Muʿayqīb from his father

[Machine] The ring of the Messenger of Allah ﷺ was made of iron covered with silver, and the word "al-Mu'aqqib" refers to the seal of the Messenger of Allah ﷺ.  

الكبرى للنسائي:٩٤٦٠ – أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ عَنْ أَبِي عَتَّابٍ سَهْلِ بْنِ حَمَّادٍ الْبَصْرِيِّ وَأَخْبَرَنَا أَبُو دَاوُدَ قَالَ حَدَّثَنَا أَبُو عَتَّابٍ سَهْلُ بْنُ حَمَّادٍ قَالَ حَدَّثَنَا أَبُو مَكِينٍ بَصْرِيٌّ قَالَ حَدَّثَنَا إِيَاسُ بْنُ الْحَارِثِ بْنِ الْمُعَيْقِيبِ عَنْ جَدِّهِ قَالَ

«كَانَ خَاتَمُ رَسُولِ اللهِ ﷺ مِنْ حَدِيدٍ مَلْوِيٍّ بِفِضَّةٍ وَكَانَ الْمُعَيْقِيبُ عَلَى خَاتَمِ رَسُولِ اللهِ ﷺ» اللَّفْظُ لِأَبِي دَاوُدَ  

See similar narrations below:

Collected by Abū Dāwūd
abudawud:4224 – Ibn al-Muthanná And Ziyād b. Yaḥyá Wa-al-Ḥasan b. ʿAlī > Sahl b. Ḥammād Abū ʿAttāb > Abū Makīn Nūḥ b. Rabīʿah > Iyās b. al-Ḥārith b. al-Muʿayqīb Wajadduh from Qibal Ummih Abū Dhubāb from his father

The signet-ring of the Prophet ﷺ was of iron polished with silver. Sometimes it remained in my possession. Al-Mu'ayqib was in charge of the signet-ring of the Prophet ﷺ.  

أبو داود:٤٢٢٤ – حَدَّثَنَا ابْنُ الْمُثَنَّى وَزِيَادُ بْنُ يَحْيَى وَالْحَسَنُ بْنُ عَلِيٍّ قَالُوا حَدَّثَنَا سَهْلُ بْنُ حَمَّادٍ أَبُو عَتَّابٍ حَدَّثَنَا أَبُو مَكِينٍ نُوحُ بْنُ رَبِيعَةَ حَدَّثَنِي إِيَاسُ بْنُ الْحَارِثِ بْنِ الْمُعَيْقِيبِ وَجَدُّهُ مِنْ قِبَلِ أُمِّهِ أَبُو ذُبَابٍ عَنْ جَدِّهِ قَالَ

كَانَ خَاتَمُ النَّبِيِّ ﷺ مِنْ حَدِيدٍ مَلْوِيٌّ عَلَيْهِ فِضَّةٌ قَالَ فَرُبَّمَا كَانَ فِي يَدِهِ قَالَ وَكَانَ الْمُعَيْقِيبُ عَلَى خَاتَمِ النَّبِيِّ ﷺ