Ok, guys more bugs.
Im using the a RPR material, see the screen shot.
There is a small area in the same location as the other bug.
I had it marked with the Blender Pen but it did not show up on the screen shot.
Also, trying out the the new shadows and its not working correctly.
See the round shadows from the diamond location.
Had that marked also but Blender is not working.
Found that one of the normals is reversed.
Tried to fix the problem by fixing the normals but that did not work.
Cleaned my vertices but that did not work also.
Ok, found out there was no face in that area.
Also removed diamonds to see shadows.
Found more bugs.
Im using a Blender Cycles Material on the left object and under it is a blueish tint.
Shadows from the diamonds area look good now and on the right are the settings for them.
Also, more dark areas on the ground from other rings. I took one of the rings apart and cant find a fix for that.
I cant figure it out. Looks like the shadows are stacking on top of each other
and adding up.
I give up.
I want to do some animations.
Trying another HDRI.
Shadows look better now.
Not many light sources coming from many directions and intensities.