Synthetic Opal Set Inside Flat Backed Cylinder Captive Bead Rings - select desired color and gauge/diameter from the drop down menus Materials: 316L Surgical Steel, synthetic opal EVERYTHING we sell is brand new, never worn. Feedback: Your satisfaction is important to us. If for any reason you feel like we don't deserve a 5-star rating in every category please allow us the opportunity to rectify the situation. While many situations such as postal delays are out of our hands, we will do whatever we can to alleviate any problems that may arise.