Opal Center with AB Crystals Belly Ring in Silver. This naval ring is a great size and it will give you the perfect mix of modern and vintage. Opal belly rings are always popular and fun to wear all year long. This one has so much sparkle! It's got iridescent gems surrounding a gorgeous faux opal. This one is becoming one of our favorites! Also available in Gold. 14 GA. 3/8" barbell. Surgical Steel material. Non dangling belly ring. 1/2" wide.