Scratched Polymer Clay Circle Studs - Black Scratched Circle Studs £22.00 £15.40 Quantity: at £15.40 each Add To Basket 1 in stock. I have a few pairs of these Scratched Circle Studs - these are all SAMPLES as they are slightly smaller than I now make them. The circles are made from polymer clay with a scratched surface and a diameter of 20mm. The earring posts and scrolls are made from surgical steel. I add an extra very thin layer of clay over the top of the earring post so that they don't come off and then re-fire them. This makes the earrings posts more secure than just glueing them on. This listing is for a pair of blakc circle studs.