Prasiolite green amethyst 9cts unmounted

beautiful unmounted Prasiolite (green amethyst). it measures 18x13m and approximate 9cts. i ran my finger around the edge and felt a tiny rough spot. i can’t see anything but only feel it. ready for your own creation. I’ve had this for many years, intended to make a piece of jewelry with it and have never done anything. i’m letting it go! if you have questions i will try and answer them as best i can.