It was narrated from Anas bin Malik that the Messenger of Allah ﷺ wore a silver ring with an Ethiopian gemstone, and he used to ear the stone in towards his palm.
أَنَّ رَسُولَ اللَّهِ ﷺ لَبِسَ خَاتَمَ فِضَّةٍ فِيهِ فَصٌّ حَبَشِيٌّ كَانَ يَجْعَلُ فَصَّهُ فِي بَطْنِ كَفِّهِ