I believe this to be Arizona Lizard stone but can not confirm that is the case. Is was a softern stone and not a Jasper. It is a double dome cabochon polished on all sides and has a 2.5mm girdle for bezel setting. The dots or orbs are pretty strong on either side and will make a nice setting.
Visit my Sold cabochon Gallery to see past opals I have cut. You will find other examples of materials, shapes, sizes, colors, and in general see my work there. Some stones date back over 15 years in there. I don’t show everything I cut, just the ones I really liked over the years. Please let me know if you have any questions about those materials.
Its also important to visit your local rockclub if you have one near by. Its a great place to start if you are new to gems and minerals. Thank you.