Bakr bin Swad'h bin Thmamh بكر بن سوادة بن ثمامة · The Book of Adornment

"The Messenger of Allah forbade me from wearing garments dyed with safflower, and from Al-Qassi, and from gold rings, and that I recite Qur'an while I am bowing."

"The Messenger of Allah had a ring of silver which he wore on his right hand. It had an Ethiopian stone (Fass), and he used to wear the stone (Fass) next to his palm."