Sunan an-Nasa'i, Volume 6, Book 48, Hadith 5281 (DarusSalam) ⓘ
It was narrated from Anas that: The Messenger of Allah [SAW] put on a ring of silver with an Ethiopian stone (Fass).
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا ابْنُ وَهْبٍ، عَنْ يُونُسَ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم اتَّخَذَ خَاتَمًا مِنْ وَرِقٍ وَفَصُّهُ حَبَشِيٌّ .
also referenced under: Hadith 5279 (Reference) & Book 48, Hadith 240 (In-Book)