Handmade double stacked, hinged 925 Sterling Silver Black Agate Stud earrings showcase their smooth, mirror like polished, generously convexed, round cut cabochons, which are set in high polished Hallmarked 925 silver. Nicely sized gemstone silver Stud earrings to complement best work attire and to contribute to an elegant look in the office or at business meetings. Secured with silver butterfly backs these earrings sit tight and won't get lost easily. Black Agate is mostly sold as Onyx, as we are silver jewelry manufacturers we label it as what it is : elegant Black Agate.