Solid 14k Yellow Gold 2mm Dark Blue Synthetic Opal Nose Stud Bone 20 Gauge 1/4" Gauge size 20 gauge; .8 millimeters Length 1/4 inch; 6 millimeters Nose stud with dark blue synthetic opal in a prong setting Solid 14k yellow gold nose ring with polished finish Straight nose bone can be worn in either nostril