حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَيُّوبَ بْنِ مُوسَى، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ اتَّخَذَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ خَاتَمًا مِنْ وَرِقٍ ثُمَّ نَقَشَ فِيهِ مُحَمَّدٌ رَسُولُ اللَّهِ فَقَالَ ‏"‏ لاَ يَنْقُشْ أَحَدٌ عَلَى نَقْشِ خَاتَمِي هَذَا ‏"‏ ‏.‏

It wasnarrated that Ibn ‘Umar said: “The Messenger of Allah (PBUH)worea ring of silver, then he had engraved on it (the words)‘MuhammadRasul Allah’ (Muhammad the Messenger of Allah). And he said:‘Noone should have his ring engraved like this ring of mine.’” Translation Not Available

Book Ref: Sunan Ibn Majah Book 32 Hadith 3639
Web Ref:  Sunan Ibn Majah Vol 4 Book 32 Hadith 3639