Sayyidah Aishah (may Allah be pleased with her) said: A gift of jewelry came to the Prophet (peace and blessings be upon him) from the Negus, in which there was a gold ring with an Abyssinian stone. She said: The Prophet (peace and blessings be upon him) picked it up with a stick, turning away from it, or with one of his fingers. Then he (peace and blessings be upon him) said to Umamah bint Abi al-As (may Allah be pleased with her), who was his granddaughter: "O little girl, wear this."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7559