Blue green fire opal 16 gauge rose gold cartilage earring, monroe, tragus or helix piercing. 316L surgical steel plated rose gold barbell piercing is 16 gauge with a 5/16" long post. The post of this opal earring is internally threaded and the top sapphire blue green opal gem unscrews from the post. Genuine opal stone is used in this plated 316L surgical steel setting, and is available in 3mm, 4mm or 5mm stone, or one in each size (a set of 3). Please choose your stone size when checking out. Will arrive in a gift box.