Shamail al-Muhammadiyah: Stating That Rasoolullah Wore The Ring On His Right Hand – Hadith No. 99 — Al-Hasan and al-Husain used to wear signet rings on their left hands.” (Hadith No. 99)

Ja'far ibn Muhammad reports that his father said: "Al-Hasan and al-Husain used to wear signet rings on their left hands."

Explanation:

Reference: Shamail al-Muhammadiyah, Stating That Rasoolullah Wore The Ring On His Right Hand, Hadith No. 99