Ibn 'Umar said: “Allah’s Messenger (Allah bless him and give him peace) chose a signet ring of silver, so it was in his possession. Then it was in the possession of Abu Bakr and the possession of 'Umar. Then it was in the possession of 'Uthman, until it fell into the well of Aris. Its engraved inscription was: ‘Muhammad is the Messenger of Allah.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا إِسْحَاقُ بْنُ مَنْصُورٍ، قَالَ: حَدَّثَنَا عَبْدُ اللهِ بْنُ نُمَيْرٍ، قَالَ: حَدَّثَنَا عُبَيْدُ اللهِ بْنُ عُمَرَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ: اتَّخَذَ رَسُولُ اللهِ صلى الله عليه وسلم، خَاتَمًا مِنْ وَرِقٍ، فَكَانَ فِي يَدِهِ ثُمَّ كَانَ فِي يَدِ أَبِي بَكْرٍ، وَيَدِ عُمَرَ، ثُمَّ كَانَ فِي يَدِ عُثْمَانَ، حَتَّى وَقَعَ فِي بِئْرِ أَرِيسٍ، نَقْشُهُ: مُحَمَّدٌ رَسُولُ اللهِ.
sunnah.com