Sayyiduna Ubadah bin al-Samit (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "The stone of the ring of Sayyiduna Sulayman bin Dawud (peace be upon them both) came from the heavens. It was cast down to him, so he took it and set it in his ring. On it was engraved: I am Allah; there is no god but Me; Muhammad is My servant and My Messenger."
Al-Tabarani recorded it; its chain contains Muhammad bin Makhlad al-Ru'ayni, who is extremely da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب اللباس / 8727