I hope you are doing well. I recently had some work done on a ring of mine, and unfortunately the jewel smith which did the work put my emerald into an acidic bath, and then also put it in an ultrasonic bath, so you can image what an oiled stone must look like now. I was in the process to beginning to re-oil the stone, when I couldn’t find any cedar oil, so that got me thinking what other alternatives do I have. I looked up colorless natural oils, and noticed that anise oil, which comes in a colorless form, has a refractive index of 1.54-1.56 which is MUCH closer to the refractive index of emeralds than cedar oil. That got me thinking, while I havent tried to oil the emerald with anise oil yet, what would be the reason that emerald treatment specialists havent used this type of oil as a treatment even though its refractive index is MUCH closer to emeralds than cedar oil. Does anyone have any information, or insights on this topic?