Product Details 20 Gauge 2mm Gem Implant Grade Titanium Open Hoop Earrings Minimalist open hoop earrings. These tiny half hoop earrings are hypoallergenic. Triple your style with these 20 gauge hoop earrings for pierced lobes. They're made with 0.27 inch ASTM F-136 implant grade titanium circular rings. Each one features a 2mm round gem charm for classic style. These understated pierced earrings are a perfect new look to try. Sold as a set of two. Half Hoop Earrings; Huggie Hoop Earrings Specifications 20 Gauge (.8mm), 0.27" (7mm) Inner Diameter, .35" (9mm) Outer Diameter, ASTM F-136 Implant Grade Titanium Circular Rings, Sold as a Pair