Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said, regarding the saying of Allah Almighty: "And let them not display their adornment except what appears of it" [Surah al-Nur: 31]: "Adornment means earrings, armlets, anklets and necklaces."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9084