I have posted before about an interesting phenomenon of decreased transparency down the c axis. This green gemstone is an excellent example of that phenomenon. Under the table, which is perpendicular to the c axis, is a bit darker olive green that is very reluctant to flash. While around the table is a ring of forest green flash that is more of what I would expect from this oval. I have to admit that I had read about this phenomenon, but never seen it as clearly before, as I now see it in this gemstone.
The oval is clean and the circle around the table bright and flashy. Once you see the duller center it is quite noticeable. The gemstone weighs 2.36 carats and keeps me twisting the stone trying to get flash from the center.