"The Messenger of Allah [SAW] had a ring of silver which he wore on his right hand. It had an Ethiopian stone (Fass), and he used to wear the stone (Fass) next to his palm." (Using translation from Nasāʾī 5197)
«كَانَ لِرَسُولِ اللهِ ﷺ خَاتَمُ فِضَّةٍ يَتَخَتَّمُ بِهِ فِي يَمِينِهِ فِيهِ فَصٌّ حَبَشِيٌّ يَجْعَلُ فَصَّهُ مِمَّا يَلِي كَفَّهُ»