The ilvaite is hammer-crafted in irregular form with hand-crafted prong setting. Each piece is distinctly one of a kind. Hammer-crafted Spiral Structure Irregular Form Crown Hammer-crafted Irregular Form Black Ilvaite Black Ilvaite with Irregular Prong Setting on Crown Attaching Shirt Button Hole as Shirt Jewelry Made in Hong Kong Size Guide: EU 53: 53mm in Circumference, US 6 1/4, JP 12 EU 56: 56mm in Circumference, US 7 1/2, JP 15 EU 59: 59mm in Circumference, US 8 3/4, JP 18