Meet the one piece you never take out. This cartilage stud earring features a 4mm round CZ solitaire set in 14K solid gold prongs with a titanium flat-back post for all-day comfort and shine. No wonder it’s your new fave. Made in responsibly sourced 14K solid gold and hypoallergenic polished titanium that's both lightweight and durable. Stone Type: Cubic Zirconia Stone Size: 4.0mm Gauge: 18G Tube Length: 5/16" Fits cartilage piercings: helix, forward helix, tragus, conch and flat.