"Anas bin Malik was asked: 'Did the Prophet wear a ring?' He said: 'Yes.' One night he delayed the 'Isha' prayer until almost the middle of the night. When he had prayed, he turned to face us and said: 'The people have prayed and gone to sleep, but you will still be in a state of prayer so long as you are waiting for the (next) prayer.'" (Sahih)Anas said: "It was as if I can see the sparkle from his ring.'" (Using translation from Ibn Mājah 692)
سُئِلَ أَنَسٌ أَتَّخَذَ النَّبِيُّ ﷺ خَاتَمًا؟ فَقَالَ نَعَمْ أَخَّرَ لَيْلَةً صَلَاةَ الْعِشَاءِ الْآخِرَةِ إِلَى قَرِيبٍ مِنْ شَطْرِ اللَّيْلِ فَلَمَّا صَلَّى أَقْبَلَ إِلَيْنَا بِوَجْهِهِ فَقَالَ إِنَّ النَّاسَ قَدْ صَلُّوا وَنَامُوا وَلَمْ تَزَالُوا فِي صَلَاةٍ مَا انْتَظَرْتُمُوهَا قَالَ أَنَسٌ فَكَأَنِّي أَنْظُرُ إِلَى وَبِيضِ خَاتَمِهِ