"The ring of the Prophet [SAW] was made of iron with silver twisted around it." He said: "And sometimes it was on my hand." And Mu'aiqib was the keeper of the ring of the Messenger of Allah [SAW].  

أَنَّهُ قَالَ كَانَ خَاتَمُ النَّبِيِّ ﷺ حَدِيدًا مَلْوِيًّا عَلَيْهِ فِضَّةٌ قَالَ وَرُبَّمَا كَانَ فِي يَدِي فَكَانَ مُعَيْقِيبٌ عَلَى خَاتَمِ رَسُولِ اللَّهِ ﷺ