Opal Glitter Prong Set Gold IP Over 316L Surgical Steel Belly Button Ring in blue. Lots of sparkle and shine and perfect for the beach! 8mm synthetic opal. 5mm ball top. 14GA. 3/8" barbell. Opal belly rings are always popular! Add a little glitter and you're ready for anything! Available in: purple, pink, white, green, dark green, aqua, blue.