Hi Pietro,
the ring shank is inside and outside to sharp. The same for the prongs on both ends.
You should round them up like it is in the real world.
The sharp edges and kornes give this ring a unreal touch.
Attached a picture . You can see inside the ring shank and outside is a small radius. On the square on top you can compare without radius. This missing radius makes the ring unreal. Also the prongs are round on top but a bit too long.
Btw nice design.
Marcus