Abdullah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) made a gold ring and turned its stone towards his palm, and the people also had rings made. So he (peace and blessings be upon him) threw the ring away, and then he (peace and blessings be upon him) had a silver ring made.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7563