They’re great plain but I also make them with a gem stone circle. These are set with Lapis Lazuli but I can use black onyx, as an alternative or pretty much any opaque stone of your choosing.
These, in the picture, are rectangular section but I also make them in an oval section. Mouse over the image to see one.
I can also make them in different widths and sections so, if you want something heavier than 8mm then please contact me.