The Prophet [SAW] wore a ring of silver with an Ethiopian stone (Fass), on which was inscribed (the phrase): "Muhammad Rasul Allah (Muhammad the Messenger of Allah)." (Using translation from Nasāʾī 5196)
«أَنَّ النَّبِيَّ ﷺ اتَّخَذَ خَاتَمًا مِنْ وَرِقٍ وَفَصُّهُ حَبَشِيٌّ وَنَقْشُهُ مُحَمَّدٌ رَسُولُ اللهِ»