Medium Square Earrings 15Handmade using the finest smooth Black Onyx Porcelain decorated with white porcelain slip and an Opal grey glaze before being high fired for durability. Ear posts and scrolls are made from surgical steel and are hypoallergenic perfect for those who cannot wear silver or gold plate earrings. A sterling silver option is available, just select your preferred option from the drop down. These medium stud earrings are approximately 12mm in size.