This stone was purchased many years ago from a store closing. Therefore, I do not know of any treatments or the country of origin. I can only assume what treatments were available in the 1970's may have been done, but again, I do not know. Because of this, I can offer a lower price point. The 2nd picture in the series will always be macro setting, which is very close, so you can see details, you might not necessarily see with just your eyes.
Remember, we have a generous return policy if you are not satisfied with your purchase!