The Prophet [SAW] had a ring and he said: "We have had a ring made with an inscription, and no one else should copy this inscription." It is as if I can see its shining on the little finer of the Messenger of Allah [SAW].  

أَنَّ النَّبِيَّ ﷺ اصْطَنَعَ خَاتَمًا فَقَالَ إِنَّا قَدِ اتَّخَذْنَا خَاتَمًا وَنَقَشْنَا عَلَيْهِ نَقْشًا فَلاَ يَنْقُشْ عَلَيْهِ أَحَدٌ وَإِنِّي لأَرَى بَرِيقَهُ فِي خِنْصَرِ رَسُولِ اللَّهِ ﷺ  

The Prophet [SAW] used to wear his ring on his right hand.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَتَخَتَّمُ فِي يَمِينِهِ  

"It is as if I can see the whiteness of the Prophet's ring on his left finger."  

كَأَنِّي أَنْظُرُ إِلَى بَيَاضِ خَاتَمِ النَّبِيِّ ﷺ فِي إِصْبَعِهِ الْيُسْرَى  

They asked Anas about the ring of the Messenger of Allah [SAW] and he said: "It is as if I can see the shining of his silver ring, and he raised his left little finger."  

عَنْ خَاتَمِ رَسُولِ اللَّهِ ﷺ قَالَ كَأَنِّي أَنْظُرُ إِلَى وَبِيصِ خَاتَمِهِ مِنْ فِضَّةٍ وَرَفَعَ إِصْبَعَهُ الْيُسْرَى الْخِنْصَرَ  

"I heard 'Ali say: 'The Prophet of Allah [SAW] forbade me to wear a ring on the forefinger and middle finger.'"  

سَمِعْتُ عَلِيًّا يَقُولُ نَهَانِي نَبِيُّ اللَّهِ ﷺ عَنِ الْخَاتَمِ فِي السَّبَّابَةِ وَالْوُسْطَى  

"The Messenger of Allah [SAW] forbade me to wear (a ring) on this finger," and it was on the middle finger and the one next to it.  

نَهَانِي رَسُولُ اللَّهِ ﷺ أَنْ أَلْبَسَ فِي إِصْبَعِي هَذِهِ وَفِي الْوُسْطَى وَالَّتِي تَلِيهَا