So this is a cabochon that has a lot of Marcasite in it. It is well formed in the agate so there will be no decomposing which happens with marcasite through oxidation. The photo is good, but does not show how well this cab sparkles. Polished on both sides with good bezels for easy 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.