Hajjaj bin al-Minhal حجاج بن المنهال · Signet-Rings (Kitab Al-Khatam)

I saw as-Salt ibn Abdullah ibn Nawfal ibn AbdulMuttalib wearing the signet-ring on his right small finger. I asked: What is this? He replied: I saw Ibn Abbas wearing his ring in this manner. He put its stone towards the upper part of his palm. Ibn Abbas also mentioned that the Messenger of Allah (ﷺ) used to wear his signet-ring in his manner.