Gold dipped circle studs - 22k gold glaze and 14k gold filled post and backing. Large: 3/8 inch (9.5mm) Inspired by nature, ocean and organic shape and texture. Porcelain is the finest clay that requires it be high-fired to maintain the purity and exceptional durability of the pieces. Each piece is hand sculpted and assembled by Mier in her studio in New York City. All jewelry are handmade from date of order.