These handmade Stud earrings are crafted with Natural Black Onyx Cabochons and Grade 23 Hypoallergenic Titanium. They are extremely durable and the post is "bend proof". 8mm Diameter (Please see reference photos). Comes with two sizes of Titanium backs for preference. Grade 23 Hypoallergenic Titanium Handmade by me! Ships in gift box Visit the Salish Sea Inspirations Store from the link at top to learn more and view all my offerings. These handmade Stud earrings are crafted with Natural Black Onyx Cabochons and Grade 23 Hypoallergenic Titanium. They are extremely durable and the post is "bend proof". 8mm Diameter (Please see reference photos). Comes with two sizes of Titanium backs for preference.