A 4-pc earring set/piercing set that represents Busan's Seagull, Ocean, Gamcheon Culture Village, and the Guang'an Bridge. This set is perfect for gift to loved ones, or friends that want to visit or wants to know more about Busan.. What's Inside. Component: 1 Everyday Busan Earrings/Piercings Set. Materials: 925 silver post (earring set), surgical steel (piercing set), blue crystal, cubic zirconia, brass, white gold plating, etc. Size: Bluestone approx. 5mm, house approx. 6 x 6mm, moon approx. 6.4mm, bridge approx. 4.2 x 9.2mm