It was narrated from Ibn ‘Umar that the Prophet ﷺ used to wear (his ring) with the stone nearest his palm.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَجْعَلُ فَصَّ خَاتَمِهِ مِمَّا يَلِي كَفَّهُ  

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