Ibn Umar used to wear his ring on his left hand.
حدثنا هناد عن عبدة عن عبيد الله
أن ابن عمر كان يلبس خاتمه في يده اليسرى
No references are available.
[Its chain of transmission is sahih] Bayhaqi narrated it in Shuab al-Iman, no. 6363, from the hadith of Abu Dawud.