Ikrimah narrates from Sayyiduna Ibn Abbas (may Allah be pleased with them both), concerning the saying of Allah Almighty: "And let them not display their adornment except what appears of it" [Surah al-Nur: 31], that he said: What is meant by it is kohl and the ring.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3216