Gauge: 16g and #124; Length: 5/16" and #124; Color: Silver and #124; Gem: Blue Opal and #124;. Sold as a single. The below measurements are approximate: The opals measure 3mm in diameter . Both ends are internally threaded. Material(s): 316L Stainless Steel, PVD plated steel, Synthetic opals. Threading type: Internally threaded. Eyebrow, Ear cartilage, Face. Sizes offered: 16g (1.2mm). Brand: Oracle