Ash-Shama'il Al-Muhammadiyah, Book 13, Hadith 101 (In-Book) ⓘ

Hazrat Ibn Umar radiyallahu anhu reports, "The Prophet of Allah sallallahu alaihe wasallam had a ring made of silver. The top portion remained towards the inside. On it was engraved 'Muhammad the Rasoolullah'. The people were prohibited from making this inscription on their rings. This is the same ring which fell from the hands of Hazrat Mu'ayqib radiyallahu anhu into the well of Arees during the reign of Hazrat Uthman radiyallahu anhu.

حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي عُمَرَ، قَالَ‏:‏ حَدَّثَنَا سُفْيان، عَنْ أَيُّوبَ بْنِ مُوسَى، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ‏:‏ أَنَّ النَّبِيَّ صلى الله عليه وسلم اتَّخَذَ خَاتَمًا مِنْ فِضَّةٍ، وَجَعَلَ فَصَّهُ مِمَّا يَلِي كَفَّهُ، وَنَقَشَ فِيهِ مُحَمَّدٌ رَسُولُ اللهِ، وَنَهَى أَنْ يَنْقُشَ أَحَدٌ عَلَيْهِ وَهُوَ الَّذِي سَقَطَ مِنْ مُعَيْقِيبٍ فِي بِئْرِ أَرِيسٍ‏.‏