These Stud earrings are handmade with Natural Black Onyx Cabochons and Grade 23 Hypoallergenic Titanium. They are extremely durable and the post is "bend proof". Tiny 4mm diameter (Please see reference photos). Comes with two sizes of Titanium backs for preference. Grade 23 Hypoallergenic Titanium Handmade by me! Shipped in gift box Visit the Salish Sea Inspirations Store from the link at top to learn more and view all my offerings. These Stud earrings are handmade with Natural Black Onyx Cabochons and Grade 23 Hypoallergenic Titanium. They are extremely durable and the post is "bend proof". Tiny 4mm diameter (Please see reference photos). Comes with two sizes of Titanium backs for preference.