Sunan Abi Dawud 4217
سنن أبي داود#4217SahihNarrated Anas:The signet-ring of the Prophet (ﷺ) was all of silver as was also its stone
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih
In-book reference: 36:4