Messenger of Allah ﷺ took a silver ring and had 'Muhammad, the Apostle' of Allah' engraved on it. The Prophet then said (to us), 'I have a silver ring with 'Muhammad, the Messenger of Allah engraved on it, so none of you should have the same engraving on his ring."  

أَنَّ رَسُولَ اللَّهِ ﷺ اتَّخَذَ خَاتَمًا مِنْ فِضَّةٍ وَنَقَشَ فِيهِ مُحَمَّدٌ رَسُولُ اللَّهِ وَقَالَ إِنِّي اتَّخَذْتُ خَاتَمًا مِنْ وَرِقٍ وَنَقَشْتُ فِيهِ مُحَمَّدٌ رَسُولُ اللَّهِ فَلاَ يَنْقُشَنَّ أَحَدٌ عَلَى نَقْشِهِ