“D” is for dialed in. This CZ-lined “D” initial cartilage stud earring is set in 14K hollow gold with a titanium flat-back post to add a personalized touch to your stack—whether it’s your name, theirs, or something only you get. Made in responsibly sourced 14K hollow gold and hypoallergenic polished titanium that's both lightweight and durable. Stone Type: Cubic Zirconia Stone Size: 0.9mm Gauge: 18G Tube Length: 5/16" Fits cartilage piercings: helix, forward helix, tragus, conch and flat.