Mishkat al-Masabih 22 Clothing كتاب اللباس 79

وَعَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَبِسَ خَاتَمَ فِضَّةٍ فِي يَمِينِهِ فِيهِ فَصٌّ حَبَشِيٌّ كَانَ يَجْعَلُ فَصَّهُ مِمَّا يَلِي كَفه

He said God’s messenger wore on his right hand a silver signet-ring with an Abyssinian stone, and put its stone next the palm of his hand. (Bukhari and Muslim.)