This is what we call a tongue cabochon and it a good size at just over 70mm long. It has a nice subtle pattern and nice waterline pattern along with classic fortification patterns to boot. The color is not extreme in any way but sometimes that makes for 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.