Opal Glitter Prong Set Gold IP Over 316L Surgical Steel Belly Button Ring in purple. Lots of sparkle and shine! 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.