Rock hard with these beautiful stone eyelets made by Diablo Organics! Diablo Organics knows how to turn precious materials into brilliant jewelry. These double flared eyelets are made of Black Onyx and polished to a high sheen, to make the stone really, really stand out. Onyx is a black mineral stone that appears solid black but if you look closely, you can spot the different layers that show some translucency. Double flared, so you won't be needing any o-rings to keep the jewelry in place.